I've been using Rotella T4 for a long time in my semi truck engine. Newer had any problems. When you change the oil in the engine you can tell that it's Rotella, because it has specific scent no other oil has. Great product.

I use this oil in several vehicles, especially my older ones. It has more zinc than the newer oils which is needed for flat tappet engines. You also can't beat the price if you use a lot of oil.

Who picked the 2.5 gallon container size... obviously they don’t change their own oil. My truck requires 13 quarts... normally 3 gallons and 1 quart. Stupid

An excellent product for the gear box of your off-road motorcycle. You get a gallon for the price of a quart of boutique oils. I have run Rotella for 15 years and never a problem. I get long clutch and bearing life.

I've used Rotella T4 15-40 in my 1300cc liquid cooled motorcycle for years because of its heat hadling capabilities and wear resistance. Very pleased with the results and does not compromise the clutch action.

Even in gasoline engines, this stuff is great! The zinc conditions the aluminum head and the cleaning agents are great in high mileage engines too!

I've used T4 in all my diesel construction for over 20 years. Never a failure to stand -up to the demands we put on it.

I've been using shell rotella since i bought my first 18Wheeler,i have never been down due to oil issues,"rotella is my brand !!"

Wouldn’t wanna run anything else in my truck, others oils don’t last and make the truck run a little funky. 1996 7.3

I have over 150 thousand miles on my 5.9 Cummins. with nothing but Rotella for my engine oil. Great protection