On my second oil change with T6, not sure why Ford doesn't recommend it for their 6.7 diesel motors. The engine absolutely runs quieter than using MotorCraft or T5. Excellent product in my opinion.

Arrived on time and In good shape. Great oil for a good price. Much cheaper than the Advanced Auto 25 miles away. Delivered to my door and I didn’t have to drive 50 miles........I’m happy.

Bought my 2011 Ram 3500 Cummins 6.7 in 2012 with 300 test miles on it. Put Shell Rotella T6 in it right away and have run nothing else. Great oil, but hard to find right now.

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.

after researching I went with this because it exceeds the high priced john deere fluid I was using on my JD 5420 4X4.There is a cold winter coming in the Adk.Mts. and I need my equipment to start well.

I use this in my Cummins diesel truck engine and in my 1985 Mercedes diesel. Only gave it a 4 as it may be the best out there but I don't know as I only use Rotella and have no basis of comparison.

I use it on my 2015 Eco-diesel with 84,000 miles. The oil gives me excellent MPG, I've gotten almost 34mpg on the highway 28-29 on the street. But the best part is getting money back and earning points!

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.

Can’t go wrong with T6 Rotella oil. Doesn’t break down and has been thoroughly tested to be proven one of the best oil available. I don’t use anything else

Really easy to find at a great price. Awesome rebate. I can run longer oil change intervals. Flows better in my cold climate. Would not use anything else in my duramax. Very happy!