Could someone please explain to me what ACEA A1 is? I know froma previous discussion regarding Valvoline Durablend that it is rated ACEA A3 which is a European standard, and I noticed that Valvoline All Climate in 5w30 and 10w30 is ACEA A1. Castrol and Havoline, (not sure of other brands) don't seem to have this listed on their packaging. Is it a superior rating to have in a conventional 5w30 and 10/30 motor oil?