My duramax and I have been extremely happy with T-6. Starts great in winter, even when -30. Made mistake of using oil a friend gave to me, truck didn't like it when temps went below freezing, started hard. Won't deviate again.

This is my go to oil for everything besides my daily driver. I use it on my motorcycle, ATV, and lawn tractor. Great product and generally the price is reasonable.

My Eco-Diesel Ram runs great with this product, it's slightly expensive but for a good reason. Including the fact that I get rewarded for using the product.

Great oil for almost any engine. I run it in my truck, tractor, motorcycle, lawnmower, and generator. One bottle to fill them all, makes my life easier.

Excellent oil, one of the best on the market! This product should be stocked on the shelve in every store nation wide. Product did arrive in time promised.

Started using this in my 09 R1 after only running Yamalube since day one. The bike runs great. No issues with the clutch. Great price vs Yamalube. Plan to keep using Rotella T6.

I buy the 5w-40 at the store, is fantastic oil. I run it in my 1999 Toyota Tacoma, Polaris Ranger and John Deere tractor. All 3 engines run quieter, cool and clean. Amazing oil. I may start running it in my lawnmower and generator as well.

I've been using this Rotella in my caterpillar engine, it has outstanding some other products and help me with cost, since I don't have to change oil as often.

I have been using Rotella-T6 in the 5W/40 weight in my turbocharged SAABs equipped with the 2.3 liter engine for over 10 years. Used Oil Analysis performed at up to 300K miles show effectively zero engine wear.

I have been using Rotella T6 5W40 in all my motors car, truck,tractor, motorcycle, lawnmower, generator and all small engines. never had a problem my Yamaha 1600 Roadstar also runs much cooler