Triax Fleet Supreme 15W-40 API CK-4 Full Synthetic Heavy Duty Diesel Engine Oil | Moly Boron Friction Modified | Extended Drain (5 Gallon)

Great oil my powersmoke idles way smoother and cold starting is a ease 8 to 10 degree difference cooler oil temperature

I've been running this in my 2020 f250 6.7l for 5 yrs now. I also use Triax in all my other vehicles as well as farm tractor and lawn mower. Their grease is also a great product. I even have neighbors using Triax as well, and to top it off they are out of Houston TX and a USA made Company which makes purchases more honorable! They are definitely a top shelf quality profuct.

Gotta say I'm happy with the performance of this oil, which I noticed when I first used it on my own F250 prompting me to switch all of our semi trucks on it. We used to run Rotella and Royal Purple on 8 long haul trucks. I've been using this oil in my trucks for about a year and a half, buying it from Ebay, and now happy to see is on Amazon Prime which is convenient for me. Performance: I had instant startup at -20F freezing temp after being left outside all night so great cold start performance, havent gotten that with other 15w40's, mostly used Royal purple until now but product seems to perform much better. For my truck (F250), had it analyzed at 10k and then 15k miles. Changed changed the oil at 15250 miles even through Polaris labs came back with green across the board. Additive depletion was less than 15-20% vs fresh oil, which is very good. Probably could have gone to 20 or 25k without issues but 15k miles is enough. Our highway semis regularly run 75-90k miles without a bypass filter. Started them out at 45k drain then gradually increased to current level. Oil analysis comes back green at 70k highway miles. TBN seems to stay at safe levels all the way through, without any TBN boosters. The viscosity also stays within the spec range of a 15W-40 all the way through, doesnt get thicker or thinner. This saves us additional cash as we dont need to use oil viscosity stabilizers. When we used other brands of oil, after about 30k miles the viscosity would drop and we had to use Lucas oil stabilizers to "thicken it up". High quality product, great price and highly recommended. Will keep using it.

2004 Duramax. This oil acts much different than the shell T6 I have been using. On start up I have less oil pressure, right at 60 psi compared to the 80 with the t6. At first I was alarmed but then I started driving on it. Even on the longest hills with a huge load this oil does not vary with temperatures. Before with the t6 I could watch the oil pressure drop as I climbed the hill and the oil became hot and thin. This stuff stay right where it was at the start of the hill and doesn’t move. With both of those things in mind this tells me how great of an oil this really is. It has less resistance to flow when cold and does not drop in viscosity when hot. That alone is incredible since I work this truck hard. The truck is noticeably quieter and seems to rev more freely! Can’t ask for anything better.

WE USE THIS IN ALL OUR DIESEL PICK UP TRUCKS , LAST LONG AND WORKS GREAT

I bought a 5g bucket and my 2003 F250 loves it. I had been using a popular, more expensive synthetic 15W-40, and as soon as I changed the oil and fired it up, I could tell the difference in about 30 seconds as the injectors quieted down and seem to run smoother - so I changed the oil in my V8 Jeep, replaced it with this oil and BAM, same thing, it ran noticeably quieter and smoother.. and yes I realize it's a heavy oil to run in a gas motor but again the engine likes it. So I have 3 buckets stacked in my barn in case the manufacturer "change's" something or quit making it. I'm picky AH and this stuff does what it says so I am endorsing it..Good stuff!

Closest to Schaeffers oil quality with moly. Price is better than Schaeffers. This is a good quality oil. Better than anything you will get off of a shelf at a auto parts store.

I really like this oil but the shipping sucks. It’s was two day shipping and late. Then today it was supposed be delivered and late again. Really frustrating but I’m sure it will eventually be here. Edit: ended up getting lost and I had to reorder it. Not the company’s fault and I still love this oil. So I changed my rating from a 4 to a 5.