I am trying to change out my oil early but I can't find any 5-20 with high holy moly content. Everywhere that sells Havoline only carries 5-30W. Same thing with Motorcraft. I bought some Castrol Synthetic Blend 5-20, but I don't want to put that in yet until after I've ran it in with a high moly content oil. Or should I? Any ideas where I can find these oils? Stores I am aware of are: Walmart, Kragen, Pep Boys, Napa. I'm in San Diego.