what I do know about synthetic oils is, at least one brand of industrial gearbox states in their manuals, that if a synthetic oil is used, you could increase the load by 25%. And as far as keeping the engine clean, that is the detergent, not whether or not it is synthetic. Also, if you are breaking an engine in, most cam manufacturers recommend using mineral based oil for the break in. I wondered why this was, so I asked Crane Cams, and the fella said it doesn't provide enough "TRACTION" to allow the lifters to spin and bed in properly.
Last edited by brokenhead; 01/28/2017 4:16 AM.
