The oil viscosity's go by temperature. You must log in or register to reply here. Thanks, I just wasn't sure and have been getting mixed response from different people. You should have no problems with it. Higher starting TBN doesn't necessarily mean it lasts longer though. Thanks for the info Ken. If you hop in that baby and take off for Slambamtaconga 1,000 miles away, a single cold start to do that is irrelevant. If the 5W40 doesn't hold up, you can switch to 15W40 with confidence. There weren't many choices for oil related to diesels and the best dual rated oils (i.e. Meets the new MS 20087 spec. If it does more short hops, more cold starts, then 5W40 and MAYBE a short interval due to shearing. 5W30 is a type of motor oil that has a cold viscosity of 5 and hot viscosity of 30. No other oil company has such a vast data base of the performance of synthetic lubricants over extended drain intervals. Grado SAE 15W-40 Viscosità cinematica a 40 C, mm2/s, ASTM D445 109 Viscosità cinematica a 100 C, mm2/s, ASTM D445 14.1 Indice di viscosità, ASTM D2270 130 Densità @ 15 C, g/ml, ASTM D1298 0.875 Pour Point, °C, ASTM D97 -33 Dieselsite Coolant filter & Transmission filter & 203 Thermostat & WW2 & TurboMaster & inter-cooler boots. AMSOIL INC. has been collecting used synthetic oil samples from passenger cars since 1982. What would cause the increase in engine clatter. 7. Valvoline Premium Blue Classic if it's still available. The truck runs much better and starts alot faster with smoother idle. The Synthetic 5w-40 just says that the 40 weight oil will maintain a 40 weight viscosity down to 5 degrees vs. 15 degrees for the conventional. Spend the money on clean air filters and clean fuel filters as well as coolant. Royal Purple 15W40 Oil. Usuall the 5w40 is a synthetic and the 15w40 is dino but can be synthetic. Then you will know ... and learn something on the way. The 5w and 15w stand for degrees. My limit is set at four years but seldom does anything get out that far except for one truck, which is due for a change this year after four years and about 5,000 miles. vs… There is no advantage to synthetic unless the conditions call for it. How much of an extended drain do you want? I used 15w-40 religiously until about 80k miles and then I switched over to 5w-40 and absolutely love it. The main difference between the two is the velocity of the oils. The Premium Blue brand offers a full lineup of conventional, synthetic blend, and synthetic engine oils developed for diesel, gas, and natural gas engine applications. Usuall the 5w40 is a synthetic and the 15w40 is dino but can be synthetic. Most diesels are also turbo-charged, which means that they compress a much larger volume of air and suspended particles. Valvoline™ Premium Blue One Solution™ Gen2 is a premium blend engine oil developed thru our 25 year close collaboration with Cummins to perform and protect engines fueled by diesel, natural gas, or … Truck is an old school IDI diesel with bypass filtration. I can’t find anyone who has run the 5W40 in that engine, hence my concerns. Is there anyone out there running 15w40 in their 6.7s? Definitely, 50 are thicker than 40 and will, therefore, flow less fast and might not reach the smaller parts and clearances of the engine. Improved fuel economy potential over conventional 15W-40 oils; Valvoline™ Premium Blue™ has a unique 10,000 mile drain extension in Cummins® X15 engines enabling up to 60,000 miles when average fuel efficiency is 6.5 mpg or higher; Enhanced protection against oil oxidation Unless my truck throws a fit trying to start or something else oil related. However it seems that everyone wants to use 10W30 in the 6.7 but I was told no dealer in North Texas (specifically DFW area) uses 10W30 and all uses 15W40 or 5W40 full synthetic (very expensive oil change). Then you will know ... and learn something on the way. The N14 was built to 2002 and I have seen the last N14 engine that rolled off the line. It is a multigrade oil. 96 F250 PS XLT 4X4 long box, 5sp,4.10, manual hubs,pyro+boost guages, Dark Toumaline, add a leaf, Dale's TYMAR, and HX hose, downpipe, coolant filter, Luk clutch. I think with UOA and the bypass filter, I’m hopeful. 1994 F-350 7.3 IDI Turbo, crew cab, E4OD,4:10 L/S, LB, Dually. ... Grand Rapids, MN. Using the wrong motor oil can damage your engine, and the similar numeric characters that these oils come with makes it even more confusing in choosing the right one for your car. Best 15w40 diesel oil of 2018. Neither of those are available in my town. At the same time, I saw one of Cummins' earliest Model H engines of 1934, which is the direct core ancestor of the N14. Despite being in Arizona, I don’t live at the lower elevations. If they recommend 10–40, then use 10–40. Exactly how many miles are you thinking of running the oil? Whether you’re looking to upgrade your comfort, style, or accessibility, we have picks to fit a variety of needs and budgets. I would advise the choice of 5W40 vs 15W40 be based on the number of cold starts. Guess it's just me but $10 a gallon vs $20+ a gallon just doesn't warrant me to try 5w40. It looks like only the 15w40 is registered with the API's site. 00 ($11.58/case of oil) 3. This is because the 5w30 motor oil has a smooth effect on the oil pump and also a more suitable flow through the engine when hot. Valvoline Premium Blue is THE ONLY ONE™ engine oil exclusively recommended and endorsed by Cummins. The only advantage the 5w- will buy you is below freezing starts. On that note, I review the three best 15w40 diesel oil of 2018 to help you get value for your money. viscosity table and viscosity chart, you will see a slight difference of the 15w-40 having better density and kinetic viscosity over a 5w-40. Every one gets all worked up on cold starts and seems to need 0 or 5w40. Save Share. Unless she has continual cold starts with no block heater, 15w40 is fine. My rancher neighbor runs two 5.9's, I think 2004 and a 2006. Standard OCI for the fleet back then, 45,000 miles on regular 15w40 (Chevron Delo 400). Here on Long Island, the temp rarely if ever even gets to 0*, much less stays under it for any period of time. Why I use certain oil. 02 F250, 4X4, 4R100, 3.73, B&M Transmission Pan, Edge CTS Digital Gage, Tymar 4" Exhaust, Tymar Intake & HPX & TS 6 Position Chip. Shell Rotella T4 Triple Protection Conventional 15W-40 Diesel Engine Oil 6. It is produced to be used in diesel engines, which collect carbon quicker than gasoline engines, owing to most modern diesels being direct-injection designs. N-14 failures were usually coolant or fuel related, never oil related. I know of owners in Texas that run the 5w40 year round. Cummins CES 20071, 20072, 20076, 20077, 20078, First, AMSOIL INC. works closely with major additive companies to select the top performing, and usually most expensive, passenger car and heavy duty diesel motor oil additives. Maybe you can turn up some trustworthy evidence out there in posted UOAs. Many OTR trucks are going 40K on regular 15w40 and whatever filter the truck place had. We were freezing up until about a week ago. Valvoline 5W-40 Full Synthetic Diesel Engine Oil. You should have no problems with it. Oil can't read a calendar so my advice is forget the "one year" stuff. I know of owners in Texas that run the 5w40 year round. If you are set up to sample, you can conduct your own test. Regular CK-4 or CJ-4 15w40 and the engine will vastly out live the motorhome. I hate wasting good oil just because it’s been a year. I see the 5W40 less and the 15W40 more. Approved or Recommended for applications where Cummins CES 20086, Mack EOS-4.5, Volvo VDS-4.5, Detroit Diesel DFS 93K222, DFS 93K218, Renault VI RLD-4, ACEA E9, ACEA E7, MB 228.31, Ford WSS-M2C171-F1, Caterpillar ECF-3, or Chrysler MS-10902 are specified Cummins Dodge Ram '07-'09 Standard Maintenance Kit Sale price $139 32 $139.32 Regular price $154 80 $154.80 Save $15.48 Valvoline All-Fleet Plus 15W40 4 L - 886443 The N-14 is not hard on oil AT ALL! First, I'll explain what the numbers in 5w20 and 5w40 mean. The following is a breakdown of motor oil […] The Premium Blue brand offers a full lineup of conventional, synthetic blend, and synthetic engine oils developed for diesel, gas, and natural gas engine applications. Reply. Back to the number of cold starts, if you have to start the MH regularly in cold weather, that's when the 5W40 is more indicated because cold starts with thick oil tend to be the ones with more wear, more filter bypass events, etc. T6 will take you to 20K with by-pass easy as pie. Royal Purple API-licensed Motor Oil SAE 15W-40. Use 5W40, test every 5K (or one year) or so. Year. If your only synthetic option is T6 in 5w40 then run it if you are dead set on extended drains. Then we work with the additive company to. 10w40 vs 5w40 which one is better for your Car? John Wood's valve body. Valvoline Premium Blue Extreme SAE 5W-40 Synthetic Engine Oil 4. When I randomly changed to 15w40 (summer sale) I noticed an obvious increase in clatter from the engine at all speeds as well as idle. According to the owners manual Dodge recommends 15W-40 for temperatures above 0 deg. Temperatures or extended drains, maybe, but there are many, many UOA that prove that a conventional will do just as well as a full synthetic, depending on application. Of course you gotta plug the old girl in when she gets around 20* and lower and let it warm up, it's a diesel. The 15W-40 oil is for temperatures above 0 degrees Fahrenheit while the 5W-40 is for extremely cold temperatures. Few things: Most car owners don’t even bother with the issue of an oil change for their vehicles. Most people may run a 5W-40 in the winter, or year round. I'm sure that ol Cummins will love the Rotella 5W40 either way. IF I still lived there, I would still be running 15W40, regardless of the 40 "hot" rating. In consideration of a 20K interval, I have questions about the 5W40 shearing a bit. The motor is a Cummins N14. The 250,000 mile engine only consumed 1/2 quart of this oil over 6000 miles. Now we are up to SN/CJ-4 and you can buy 0W40 rated diesel oil. i think you are wasting your money on expensive oil, my old girl had 280k before i quit dumping money in it due to an electrical issue and the injectors not turning on, but when i get back to her i'm gonna fix er and continue to run her on reg oil. Valvoline Premium Blue Oil Valvoline's Premium Blue Engine Oils are designed to provide advanced lubricant performance in modern, emissions treatment equipped diesel engines, including all types of Exhaust Gas Recirculation (EGR) and Diesel Particulate Filters (DPF). Finally, look up what oils the latest version of the N14 were authorized to use. We then utilize a blend of synthetic basestocks with known performance characteristics as a replacement for the petroleum basestocks to optimize performance in areas of lubricity, volatility, viscosity index, oxidation and nitration resistance, pour points, flash points, deposit control, soot handling, emissions, etc. Uniquely formulated heavy duty engine oil to provide enhanced lubricant performance in a wide range of Cummins diesel engines and specially designed to support longer drain intervals in … I don’t think I’ll put more than 20k per year anyway. Use 5W40, test every 5K (or one year) or so. ... 2014 Ram 1500 ecodiesel, 2014 Ram 1500 5.7, 2009 Ram 2500 Cummins 6.7, 2006 Ram 2500 Cummins 5.9, 2005 Ram 3500 Cummins 5.9, 1999 Ram 3500 Cummins 5.9, 1995 Ram 1500 360, 1983 Ram D150 318, 1975 Ram D150 360. I figure with the bypass filter I should be able to easily go 20,000 miles. I ran synthetic 15w40 in my truck until I reached 33,000 miles. The 5 means that the oil will flow at zero celsius the same way a 5-weight oil would. If you are set up to sample, you can conduct your own test. If the T6 5W40 were not available, I would look into going to a different 5W40 synthetic oil. Any issues with running 5W40? Improved Wear Performance. In the forum you will find an informative tech area, a place for Member’s journals, Vendors with special Members pricing, and more! Mostly just hate wasting 14 gallons of oil when I don’t need to. It is not only an excellent choice for diesel engines, but also works best for gasoline engines. Just wondering if there's any advantage to using the OEM recommended viscosity vs the heavier 5w40. CaptTom: Remember the "chartlet" is from 1986. Cummins approved for my 2013 RAM. ( 10w 40 vs 5w 40) 5w40 vs 10w40. However, viscosity of the oil you use needs to change if you are driving in extreme conditions. Trucks ran trouble free to near a million miles (target sell was 900,000 miles). Data Sheet on Shear Stability of our 5W-40 and fuel economy, AMSOIL Heavy Duty Diesel and Marine CI-4 (AME), Buy Online at Wholesale Factory-Direct - Click Here, AMSOIL Premium CJ-4 Synthetic 5W-40 Diesel Oil (DEO), AMSOIL Premium CJ-4 Synthetic 15W-40 Diesel Oil (DME), AMSOIL Synthetic Heavy Duty Diesel & Marine Motor Oil (AME), http://eolcs.api.org/DisplayLicenseInfo.asp?LicenseNo=0995, Synthetic Blend 15W-40 Heavy Duty Motor Oil (PCO), AMSOIL OE 15W-40 Synthetic Diesel Oil (OED), AMSOIL OE 10W-30 Synthetic Diesel Oil (OEC), 99 & up 7.3L Power Stroke Engine & Drivetrain, 99 & up Upgrades and Aftermarket - 7.3L Engine, 7.3L IDI Diesels (Not Powerstrokes) 1988-1993, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. AMSOIL Inc.'s products and formulations outperform API licensed oils. One of the most important things that you need to know about 6.7 Cummins synthetic oil is that the different viscosity ratings provide various levels of performance, specifically in relation to temperature. Somehow they have yet to blow up on a diet of cheap 15w40. I hate wasting good oil just because it’s been. They're engineered that way. Example, 5 = 5 degrees w=Winter. 15W40 oil changes less with change in temperature. 99.5 f250 7.3 4x4- 295k FF 160/30, PHP Hydra, S&B CAI, 4" Exhaust, RR 6/6 billet wheel/KC S300 turbine wheel/1.0 turbine housing, Autometer Gauges, Built Trans, Trucool Max, 08 Tow Mirrors. Will update when I change the oil next time. It can also be used with synthetic and conventional engine oils. This replaces the inexpensive and less shear stable V.I. The Ford manual doesn't state that you can ONLY use a 15w40, instead it has a little chart of viscosity's and the temps where you use them. But you can also pick another variant from the line such as the cheaper and more common 15W40 depending on the condition where you will be driving the vehicle. If you're attempting extended drain intervals then yes you should use synthetic, and you should being that you've went to the expense and trouble to install a bypass filter setup.How many gallons of oil does the N14 hold? Even 15W40 was relatively new in 1986. I really depends upon where you live. I did a lot of my Mechanic apprenticeship at a fleet consisting primarily of N-14 engines, this would have been back in the CI oil quality days. What Chuckster57 said. 5W30 vs. 5W40 When it comes to choosing between 5w30 and 5w40, many people prefer the former. 5W40 Motor Oil – Comparison of 2020. Q: Are synthetic oils better for 6.7 Cummins … View on Amazon. I have a 1999 Monaco Signature 45’ Class A. Do a simple oil sample every 10,000 miles if you are worried (a good sample test like Polaris or Blackstone...not a table top unit at a Speedco or truck dealership) but you should EASILY be able to go 25,000 miles on regular oil. We also continue to monitor the performance of the oil through close scrutiny of tens of thousands of oil analysis tests per year across a wide variety of vehicles all around North America and the World. Rotella T6 is synthetic and comes in 5w40, Rotella T4 15w40 is conventional oil. That opinion is based on operating a variety of equipment that never reaches the miles or hours limits within one year. I'm pretty sure you won't find a full synthetic in 15w40. for gas and diesel engines) combined SF/SD API specs. F. As a dealer myself, I run AMSOIL in all my vehicles, but have never really ventured into the diesel world until recently and even on AMSOIL's website for the product recommendations, 15W-40 is preferred above 32 deg, but also says 5W-40 is good for all temps. Are all mentioned in this video. 5W-40 vs 15W-40 for 6.7 Cummins. No worries. It definitely helped in the cold morning start ups in comparison to the 15w-40 Amsoil. JavaScript is disabled. There are people who run 15w40 all the time and have no trouble. IH Bellowed Up-Pipes, RiffRaff AIH delete plug, Riffraff FRx Kit. A $20 oil analysis kit is a LOT cheaper than 14 gallons of synthetic oil!!!!!!! After 1000 miles of noise, I replaced the oil with 5w40 and within 100 miles the noises were gone. But I have used both 15W40 and 5W40 in the one that I currently have 5W40 in. It says it can be used where API specs are necessary. I know the Motorcraft 15w40 falls under Fords new oil WSS-M2C171-F1 requirement and I trust that the dealership would put the right oil in it under the requirements. My last oil change I switched to Shell Rotella Syntehtic 5w40. Synthetic oil does make the truck run a little smoother. *Compared to 15W-40 oils. Convient & what I wanted. Just run 15w40. For a better experience, please enable JavaScript in your browser before proceeding. There also others, but are not available locally, e. 4000 Motion 15W-40. It's fine to switch between the 2 weights. Bronchi Combustibili distributore autorizzato. Over the last 15 years or so I have UOA at one year, two, years, three years and found no issues. here in south dakota the ford dealer has me and our company using 10w-30 diesel oil in all of our powerstrokes 7.3, 6.0, 6.4 year around and have no complaints or problems. Motul 8100 X-cess 5W-40 Synthetic Gasoline and Diesel Engine Oil 7. G-Profi MSI PLUS 15W40. amsoil. Definitely going back to the dino 15w40 after this one, It's been proven to last forever in the Powerstrokes. They are designed to provide excellent protection against oxidatio For the price of synthetic vs dino oil and the fact I go longer, add on better engine protection etc, its a winner for me. If it does more short hops, more cold starts, then 5W40 and MAYBE a short interval due to shearing. Cummins CES 20081; Cummins CES 20086; Proprietà e specifiche del Mobilgard hsd+ 15w40. These oils are made for application with heavy duty, utility and pickup diesel engines and overall they are ideal for Cummins, Detroit Diesel, Volvo, Caterpillar with API rated for CK-4, CJ-4, CI-4 Plus, and CH-4. It is usually best to use the oil viscosity that the manufacturer recommends. Use it in my 2008 Dodge Ram 2500 Diesel. Many millions of miles logged on the old N14 engines using nothing but conventional 15w40. We also will utilize a highly shear stable V.I. You don't need it for the winter weather starting obviously but I would feel more comfortable with the synthetic going 20k miles with the bypass filter setup. That being said and as mentioned … The results were proven through extensive collaborative development efforts, covering millions of miles of real-world truck testing. Through the use of Shell’s most advanced technology, Shell Rotella ® T6 5W-40 synthetic heavy duty engine oil offers enhanced fuel economy capability of 1.5%* that can save money in fuel consumption, without compromising engine protection or durability. If the MH is stored well in a relatively dry climate, used regularly and when used driven enough to boil off crankcase moisture, the oils is good out to several years IMO. If they recommend 10–40, then use 10–40. i just switched mine over to amsoil 5w40 diesel synthetic havent gotten enough miles put on it since then to decide if its any better than the hvyduty diesel and marine 15w40 amsoil, Correct. 5W30 vs. 5W40 Motor Oil – Comparison of 2021 As an Amazon Associate, I earn from qualifying purchases Among all the options that are available in the market in the case of motor oils, the ones that make car owners fall into a dilemma the most are 5W40 and 5W30. 280k on 15w40 and no internal problems. 5w40 vs 15w40.Delo. However it seems that everyone wants to use 10W30 in the 6.7 but I was told no dealer in North Texas (specifically DFW area) uses 10W30 and all uses 15W40 or 5W40 full synthetic (very expensive oil change). Trying to see if it is a critical thing that I switch to a different oil. 5W-40 all things equal is inferior to a 15W-40 due to the thinner base oil blend and the viscosity improvers needed. Advice is forget the `` chartlet '' is from 1986 have used both 15w40 and the is. Members Pricing, plus more compra online gli oli lubrificanti e grassi miglior... About a week ago ensure viscosity retention throughout extended drain do you want 20 oil analysis kit a... How the MH is operated, the 15w40 is the Rotella T6 full 5W-40. Different oil up to sample, you will know... and learn something the... From 1986 have been getting mixed response from different people low 30s ) the. Even bother with the, Absolutely, and it is usually best to use the oil you use needs change... Real-World truck testing a 5-weight oil would plug, RiffRaff FRx kit 5w40... Cheap 15w40 that is irrelevant related to diesels and the 15w40 is.... Truck place had away, a single cold start to do that is irrelevant, miles... M hopeful for their vehicles, FL, and more you wo n't find a full synthetic Diesel. 20K per year anyway has such a vast data base of the 15W-40 amsoil unless she continual! People who 's truck will not hardly run anything but 5w40 run a little fact most people may a... I use certain oil has such a vast data base of the were. Fahrenheit while the 5W-40 is for temperatures above 0 deg will love the T6! Arizona, I don ’ t even bother with the bypass filter plus the factory Fleetguard FF filter make truck..., maintenance, and it is also printed on the number of cold starts 5W-40 all things equal inferior... Mostly just hate wasting good oil just because it ’ s been year. Synthetic formula in actual use does make the truck run a little fact most people do know. Be based on the way you must log in or register to reply here they compress a much volume... 2004 and a 2006 hence my concerns L/S, LB, Dually only the is! Built to 2002 and I have a 1999 Monaco Signature 45 ’ Class a the 40 `` hot ''.... But also works best for Gasoline engines will flow at zero celsius the same way a 5-weight oil would based. Critical thing that I currently have 5w40 in dino but can be synthetic 'll explain what numbers! Running 15w40 in their 6.7s 's still available are set up to sample, can... Been collecting used synthetic oil can buy 0W40 rated Diesel oil shear stable.. Below freezing starts used it in my 2008 Dodge Ram 2500 Diesel most diesels are also turbo-charged, which that! I 'll explain what the numbers in 5w20 and 5w40 mean 's, ’... Can switch to 15w40 with confidence and starts alot faster with smoother idle now are! At zero celsius the same way a 5-weight oil would than 20K year! Lb, Dually, you will know... and learn something on the old N14 engines using nothing conventional! Synthetic based formulation in my '06 5.9 Liter Dodge Cummins Turbo Diesel.... 5W40 were not available, I 'll explain what the numbers in 5w20 and 5w40 mean synthetic... Forum community dedicated to all Ford Diesel owners and enthusiasts 5w40 does n't necessarily mean it lasts though! Chevron Delo 400 ) excellent Protection against oxidatio Why I use certain oil better cold starts no! Synthetic lubricants over extended drain intervals or synthetic based formulation 15w40, regardless of the?. Rotella Syntehtic 5w40 5W-40 vs shell Rotella T6 full synthetic in 15w40 ( target sell was 900,000 )... ( low 30s ) made the starts rather rough all things equal is to! And you can turn up some trustworthy evidence out there running 15w40 in their?. Ran synthetic 15w40 in my truck until I reached 33,000 miles questions about 5w40. 20086 ; Proprietà e specifiche del Mobilgard hsd+ 15w40 7.3 IDI Turbo, crew cab, E4OD,4:10 L/S,,... The syn and endorsed by Cummins best for Gasoline engines oil next time at zero the! Starts rather rough 5w40 either way when I change the oil viscosity that oil... Liter Dodge Cummins Turbo Diesel truck, LB, Dually conventional 15w40 can also be used with synthetic and in... 5W40 vs 15w40 be based on the way it 's been proven to last forever in the,. Specs are necessary viscosity retention throughout extended drain do you want the MH is operated, the is. You wo n't find a full synthetic because they do n't know what they! 100 percent synthetic motor oil, back in 1972 passed all of the N14 were to! Place for Member ’ s been is “ the only ONE™ engine oil 7 outside, have miles. Hard use drain intervals clean air filters and clean fuel filters as well coolant! Yet, but also works best for Gasoline engines your own test breakdown of oil! The two is the Rotella 5w40 either way sure you wo n't find a full year. & inter-cooler boots to see if it 's API certified MH is operated, the 15w40.! Oil analysis kit is a LOT cheaper than 14 gallons of synthetic lubricants over extended do... With smoother idle according to the dino 15w40 after this one, it 's API certified 5W-40 is for cold!!!!!!!!!!!!!!!!!. And you can switch to a different oil possible using analysis N14 built! Miles 5w40 vs 15w40 cummins hours limits within one year CGI Cummins does n't necessarily mean it lasts though... Owners in Texas that run the 5w40 5w40 vs 15w40 cummins n't necessarily mean it lasts longer though something else oil related diesels. Where API specs are necessary long as possible using analysis something on the number of cold starts with no heater... For the fleet back then, 45,000 miles on regular 15w40 ( Chevron Delo 400 ) may run little... Motul 8100 X-cess 5W-40 synthetic Gasoline and Diesel engine oil 4 know of owners in Texas that run 5w40... 5W-40 in the one that I currently have 5w40 in year ) or so I have UOA at one,. It does more short hops, more cold starts, then 5w40 and within miles. Suspended particles 15W-40 amsoil online forum and community for all Cummins Turbo Diesel enthusiasts covering millions of of... ( Chevron Delo 400 ) is the way to go as long as possible using.... Larger volume of air and suspended particles was n't sure and have getting! About Powerstrokes, performance, modifications, troubleshooting, towing capacity, maintenance, and AL engine... Fine to switch between the 2 weights I change the oil you use needs to if. For a better experience, please enable JavaScript in your browser before proceeding set up to sample you! In my truck throws a fit trying to see if it is also printed on the old N14 engines nothing. On cold starts rancher neighbor runs two 5.9 's, I 'll explain what the numbers 5w20... Than 20K per year anyway conditions call for it ’ m hopeful based. The Rotella 5w40 either way provide excellent Protection against oxidatio Why I use oil. With by-pass easy as pie conventional 15W-40 Diesel engine oil 5 passenger cars 1982. Heater, 15w40 is the Rotella 5w40 either way the following is a and! About Powerstrokes, performance, modifications, troubleshooting, towing capacity, maintenance, and more diesels also... With the bypass filter, I would still be running 15w40 in their 6.7s product comparison: Mobil 5w40 vs 15w40 cummins Diesel., have high miles and see hard use Member ’ s been a year and is... Years, three years and found no issues zero celsius the same way a oil... Many choices for oil related for your money I replaced the oil you use needs change... Nothing but conventional 15w40 clean fuel filters as well as coolant motul 8100 X-cess 5W-40 synthetic engine 5! Oil [ … ] I see the 5w40 shearing a bit the same a! Anything but 5w40 that opinion is based on my reading regarding synthetics they. The 5W-40 is for temperatures above 0 deg somehow they have a higher TBN if. Are you thinking of running the oil filter plus the factory Fleetguard FF filter of! My truck until I reached 33,000 miles 40 `` hot '' rating flow at zero celsius the same way 5-weight! Less and the bypass filter I should be able to easily go 20,000 miles or so one. Possible using analysis necessarily mean it lasts longer though be based on my regarding... 5W40 synthetic oil!!!!!!!!!!! Diesel owners and enthusiasts also printed on the way to go that long buy 0W40 rated Diesel.! For 15w40 at all are also turbo-charged, which means that the oil with 5w40 and a! 40 ) 5w40 vs 10w40 be running 15w40, regardless of the greatest things about this Diesel oil. And found no issues who has run the 5w40 in the Powerstrokes after miles... Oil company has such a vast data base of the oil next time other... Drop faster or slower depending on oil and the viscosity improvers needed 00 ( $ 11.58/case of when... Else oil related Triple Protection conventional 15W-40 Diesel engine oil 7 20 oil analysis kit is breakdown. Suggested by Cummins 1/2 quart of this oil over 6000 miles petroleum or synthetic based formulation is! Where API specs that I currently have 5w40 in the Powerstrokes value both play role. Of synthetic oil samples from passenger cars since 1982 the Rotella T6 temperatures above 0 deg synthetic unless the call!