So, I'm getting a 2004 Subaru, 2.5L, Subaru wants several oils, 5W30, 10W30, 10w40, all in SL with SJ acceptable ILSAC GF3. Mostly, I guess I'll run 5W30. So you guys with older engines, are you dosing with ZDDP, running an HDEO, or just using the new oils with confidence? This one has new head gaskets and is pretty tight. I'm not going to be redlining it, this car will be an exercise in durability.