nomadwilly wrote:
I'm going to disagree w this** ...again. Mechanics are'nt engineers. They are qualified to make adjustments, do general maintenance, repair things and take things apart and put then back together. They don't formulate lubrication specifications or how much load you can put on an engine under what circumstances. If you're going to ask your mechanic what oil you should use I strongly advise you to ask him what the manufacturer recommends. The Ford Lehman manual recommends single weight oil from 10W to 40W depending on what temperature your weather is. The book recommends API CC rated oil. That is different than Delo 400 (CF/SL).You could call a Chevron distributor and ask him about the API rating. It may be that "CC" is an old designation and the the rating letter groups have changed. I seem to recall that that happened. They can't tell you what oil to use in your engine any more than a mechanic but they can say if one API rating is equivalent to another. Kinda like the sizing of car tires over time.
Al Ross,
What is the API rating for Shell Rotella without the "T"? "T" must be for turbocharged engines. My old Sabre 120 manual recommended Rotella and it is the same Ford engine as the Lehman. I don't have the manual as it is w the new owner. I would be surprised if the API rating was different from the Delo.