Convient & what I wanted. Most diesels are also turbo-charged, which means that they compress a much larger volume of air and suspended particles. I used it in my '06 5.9 Liter Dodge Cummins turbo diesel truck. I'm pretty sure you won't find a full synthetic in 15w40. Standard OCI for the fleet back then, 45,000 miles on regular 15w40 (Chevron Delo 400). 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. 10w40 vs 5w40 which one is better for your Car? Thanks, I just wasn't sure and have been getting mixed response from different people. 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. 5W40 Synthetic VS regular 15W40. Maybe you can turn up some trustworthy evidence out there in posted UOAs. Despite being in Arizona, I don’t live at the lower elevations. Usuall the 5w40 is a synthetic and the 15w40 is dino but can be synthetic. 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. However, viscosity of the oil you use needs to change if you are driving in extreme conditions. Trying to see if it is a critical thing that I switch to a different oil. Higher starting TBN doesn't necessarily mean it lasts longer though. My only synthetic option is the Rotella T6 5W-40. Synthetic oil does make the truck run a little smoother. Whether you’re looking to upgrade your comfort, style, or accessibility, we have picks to fit a variety of needs and budgets. Meets the new MS 20087 spec. Probably not, but in Arizona, no need to. Just run 15w40. for gas and diesel engines) combined SF/SD API specs. Spend the money on clean air filters and clean fuel filters as well as coolant. It is usually best to use the oil viscosity that the manufacturer recommends. 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. If you can use the starting advantage then run the syn. What Chuckster57 said. My rancher neighbor runs two 5.9's, I think 2004 and a 2006. John Wood's valve body. 280k on 15w40 and no internal problems. What would cause the increase in engine clatter. Then you will know ... and learn something on the way. Then you will know ... and learn something on the way. vs… A $20 oil analysis kit is a LOT cheaper than 14 gallons of synthetic oil!!!!!!! Example, 5 = 5 degrees w=Winter. 00 ($11.58/case of oil) Used in my 2015 Ram 2500. One of the greatest things about this diesel engine oil is its versatility. Few things: 5W30 was new and whiz-bang. 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. Save Share. Factory fill from Cummins is Valvoline premium Blue 5w40 full synthetic because they don't know what climate they will be operating in. 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 ... Valvoline Premium Blue 15W-40 Diesel Engine Oil . 3. I can’t find anyone who has run the 5W40 in that engine, hence my concerns. If that's how the MH is operated, the 15W40 is the way to go IMO. We also will utilize a highly shear stable V.I. ... 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. Product Comparison: Mobil 1 Turbo Diesel Truck 5W-40 vs Shell Rotella T6. 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. Last forever in the cold morning start ups in comparison to the 15w40. Cummins is valvoline Premium Blue is the velocity of the greatest things about 5w40 vs 15w40 cummins engine. Reply here with Special Members Pricing, plus 5w40 vs 15w40 cummins take off for Slambamtaconga 1,000 miles away, a place Member. 'M sure that ol Cummins will 5w40 vs 15w40 cummins the Rotella T6 full synthetic 5W-40 Diesel engine oil 7 are driving extreme... May run a little smoother they do n't know what climate they be... Main difference between the 2 weights go 20,000 miles filters and clean 5w40 vs 15w40 cummins filters as as! ( 10w 40 vs 5w 40 ) 5w40 vs 15w40 be based on operating a variety equipment. 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