Lynnmor wrote:
brooks379 wrote:
I have used Shell Rotella oils for 40 years in all my semi trucks ....GREAT OIL !!! I know because I had to pay for any motor rebuilds and I never had one go down due to oil. Wore a bunch of trucks out by putting over a million hard miles on them.....infame them, fill them up with Rotella and hit the road. I use full syn. oil in my 6.7 does Ford even sell a full syn. oil ? Rotella tried and true !!!
You need to understand that things have changed. With the beneficial anti-wear additives removed, the Rotella has not passed the Ford testing. Rotella no longer tried and true. Suggesting the use of a product that you know is faulty is not something I would do. Yes, I have used T6 and when my supply runs out it is time to find something that passed the tests.
Shell Rotella: T4 10W30 and T5 15W40 has Ford's latest oil specification.
Also Valvoline Premium Blue Extreme 5W40 has Ford's latest specification too.
It's pretty simple to determine what will pass Fords specification. If it's a API CK/SM rating you should be good. If it's a API CK/SN I would use with caution for now.