That's interesting I wonder how that would work in my truck. The dual pumps shear oil in about 3000 miles and there is a difference on how it runs. How much is shaffers and how much was the fs2500?

Personally I think the tests are kind of a waste of money because if your engine did need a rebuild I would never spend thousands on a rebuild just because an oil sample told me to. Id run the engine till it wouldn't anymore then do it!