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.

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.

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.

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.

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!

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.

When your running a 7.3 powerstroke good oil is a must. This oil has my truck purring line a kitten. Much easier engine starts even in the heart of winter.

I feel that this oil gives better protection for the engine during colder months, as well as being better for the turbocharger's high heat conditions. No oil analysis has been done, but good service with 2 motors having almost 180,000 miles each.

This stuff is excellent. I add this to all my vehicles, my Escalade, X5, Q7, Explorer, Silverado... on my German cars I add Ceratec. Per oil analysis, it does excellent.

Good oil