This is a question for me for a long time and I think you guys can help me with that. Let say, a car's factory recommend(modern Honda and Ford) 5w-20(I am in Calif so no sub zero temp), what happens if I use a 20W-50 oil in it? It is not a turbo engine. But will "thicker" oil give better protection? Or will it hurt the internal parts because it is thicker? Will it cause more pressure on the interanl parts? I know the mileage may hurt but it is immaterial to me if it gives better protection.