I don't bother with UOA's as one analysis costs as much as replacing with another batch of oil. I am just going by what the oil gauge does with a lighter weight of oil in warmer temps. Seems an overkill approach to a 1950's design engine. I like using decent stuff like the next guy, but I have other things to worry about. Now if I drove and engine that would cost me 30K to replace, that would be another story...