I assume you mean Penn Plat not Penn Prem. Both oils are very good. UOAs are not a way to measure how much an engine actually wears, only a tear down can determine that. UOAs can tell you the condition of the oil or if outside contaminates are in the oil. Coolant, fuel, dirt getting past the air filter, etc. As for mileage, I've been doing 10K OCIs since the 70s with M1 oils.