I'll start out by saying these oil brands in question are what I use most often and now have two new vehicles on M1 0w20 EP, but like PP for 5w30. What he said is bull since we all know PP does not stand behind long OCI's like Amsoil, Castrol, and Mobil … if PP don't, I won't …
He'd been better off making some other argument …
As a mechanic … would not let this guy touch my lawnmower … much less listen to anything he says on lubricants …