Quote:
Originally Posted by hanleyclifford
I agree with these observations. Just to complete the picture, I see STP as a thickener, coater, and protector type of product.
|
STP is a viscosity boost. That' all it is. It will turn a any oild grade (like 10W30) into a much higher viscosity depending on how much you add to a given quantity of oil.
The general information I see from those who test oil is that it only has a benefit in really old engines that burn oil and should actually be rebuilt.