4.96 / 5.0
(25) 25 total reviews
Full synthetic, friction-modified 15W-40 diesel engine oil for all API CK-4 heavy duty diesel engines equipped with DPF, SCR and EGR systems.. Ideal for diesel pick-ups (Powerstroke, Duramax, Cummins), semis, heavy equipment. Volvo, CAT, Ford, GMC and many others.
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Description
TRIAX Fleet Supreme synthetic diesel engine oils are the top choice for maximizing engine performance. These are state-of-the-art engine oils are built with performance as a priority while maintaining complete OEM spec compliance. TRIAX Fleet Supreme oils are fully formulated products synthetics, designed for complete API CK-4 compliance and exceed OEM specifications for advanced turbocharged diesel engines, such as Volvo, Cummins, Detroit Diesel, Mercedes Benz and Ford fitted with exhaust after-treatment devices such as DPF and SCR.
The ideal choice for long haul trucks, pickups, including Powerstroke, Duramax, Cummins and many others.
- Excellent durability even in adverse conditions such as towing, hauling,
- High shear stability, stays in grade even under high loads and temperatures
- Exceeds all CK-4 related OEM specifications.
- 48% less wear vs the CK-4 specification requirements.
- Noticeably quieter engine operation • Faster, quieter turbo charger spooling
- Eliminates stiction in HEUI injectors
- Large specification coverage across many OEMs.
- Extended drain intervals: 25,000 miles for pickups and over 100,000 miles for long haul semi trucks.
Available Viscosity Grades: 5W-40, 10W-30, 15W-40 and 5W-30
Specifications
- API CK-4, CI-4 and CI-4 Plus
- API SN, SL (15W-40, 5W-30)
- Military Specification MIL-PRF-2104K
- Caterpillar ECF-3
- Volvo VDS-3, VDS-4, VDS-4.5
- ACEA E7, E9-12
- Mercedes Benz MB 228.51, 228.31
See data sheet for all specs.
OEM Cross-Reference
• Shell Rotella T6 15W-40

Ive been using Triax for almost 70K miles on my 2014 F350 6.7 Powerstroke. Engine runs noticeably more quietly and smoother with the added benefit of not burning oil and having to add between oil changes. You couldnt pay me to switch brands.
Great price point on the oil. plan on changing tomorrow will know more about it after that
Haven't used this oil yet but if its like the other stuff I have used from them it is the best out there
I Just started using Triax brand but right after I did the oil change I noticed a quiet down of the valve train and it seems the motor loosened up a bit. I am doing a complete fluid swap on my truck with Triax starting with atf transmission, transfer case, then diffentials. I was using T6 but Im sure this is a better oil. Probably run 5000 first change just to flush out the old oil then may try 7500 since I tow a lot
Very impressed with the oils, I exclusively use this in my Tractors, Trucks. In cold weather the oil has been holding up great and for our summers where it can get to triple digits.
Definitely my go to oil now. Use to use Mobil Delvac Extreme 15w40. Oil pressure stays more consistent and for longer intervals. Oil pressure drop was noticeable when older. Not this stuff.
I've been using Fleet Supreme for over 6yrs now. Starting with my Highly modded 05 6.0 powerstroke (Rebuilt last year with absolutely no wear) and then 15 6.7 powerstroke work truck. I run nothing but Triax products now from oil,ELC coolant,Trans fluid,ect. Even cleaners. Lol. I constantly recommend this oil to everyone! Phenomenal in every way. Smokes the competition (Not the oil) lol
I have been using TRIAX for more than a year in my KWT680 trucks, and the performance and oil pressure have been the best. 100% RECOMMENDED
I have used Triax oil for over 10years now always works good. No deposits or sludge in my engines
been using triax 15/40 in my 5.9 12 valve dodge cummins for about 10 years now. she has 467k on it and purrs like a kitten. I change it every 5k and dont have to add any oil between changes. I am sold on TRIAX !!
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20+ Years In Business
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1M+ Customers Worldwide
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Manufactured in the USA