I have been using synpower recently, with good results, although I have never had an oil analysis done. The other day I was having a conversation with my friend who works at the GM parts counter, he told me he can get me the new dexos approved ACDelco full synthetic for around $4 a quart. This is significantly cheaper than Valvoline synpower. My question is, would switching to ACDelco full synthetic be a step backwards? Or could it be a better oil than what I'm using? I can't find any information on the new full synthetic. Although i would assume it has moly rather than sodiumm, like valvoline. The only thing on the web is the old ac delco synthetic blend, which they are no longer selling or using in GM dealers. Your input is much appreciated, thank you