Hi guys, My brother just bought an '02 Imprezza 2.5RS. Manual recomends 5w30 with energy conserving II but also goes on to reccomend various oils such as straight 30 and 40, and 20w50 for very warm or heavy duty conditions. I currently use M1 0w40 in all my familys other cars (2 Volvo turbos, one Audi turbo, and a 24v VR6 Jetta GLI). I would like to use it in the Suby as well just because it is nice to stock only one oil Anyway, I would think the 0w40 would be good here in Minneapolis all year. 0 good for the cold winters (car parked outside) and from what I understand M1 0w40 is a bit thin for a 40 so should be just about right for summer. Any comments?