Gentlemen;
This has been debated here, quite a bit.
I know from experience that; there are several (grades) of oil products, especially with all the 'imports' in the country now. :p
The 'commercial grade' oil is best for (Hot Rod) engines. This is because; It's formulated for heavy duty usage and the "detergent action" lasts much longer.
Dello (SO-Chevron) and Rotella (Shell) are two that I know of. SAE 30 weight is perfered.
Multi-grade is for exterme/rapid tempature shifts and lack of proper maintance, from the (general) public. It was (originaly) developed by/for the Military in WWII because; they couldn't service the vehicles regulary etc. :rolleyes:
Also; most cam/lifter failures are from counterfiet (tiawang) parts and NOT our oil.
Happy trails.
PS: Hot Rod Magazine & 'the like' are entertainment publications (not Trade Journals) that sell products for their advertisers.
