Originally Posted By: A_Harman
The UOA results that I saw on the MC 5w50 on a prominent Mustang enthusiast site showed that it sheared to a 40-weight within 1000 miles of street use, and to a 30-weight if the car was run in a track day. So if Ford is unconcerned about it shearing that badly, why bother specifying a 50-weight at all?
In the Ford supply chain, 50 weight goes in sports cars, 40 weight goes in trucks, 30 weight goes in Ecoboosts and 20 weight goes in everything else. What happens after that is irrelevant.
The UOA results that I saw on the MC 5w50 on a prominent Mustang enthusiast site showed that it sheared to a 40-weight within 1000 miles of street use, and to a 30-weight if the car was run in a track day. So if Ford is unconcerned about it shearing that badly, why bother specifying a 50-weight at all?
In the Ford supply chain, 50 weight goes in sports cars, 40 weight goes in trucks, 30 weight goes in Ecoboosts and 20 weight goes in everything else. What happens after that is irrelevant.