In all season driving, cold, snow, high humidity,,desert extreme heat,...CASTROL GTX 10w-40 weight,in city driving, stop and go traffic,a good 10w40, or 20w 50 weight oil will give your engine good protection,Pennzoil 10w-40,Texaco Havoline 10w-40,Mobil 10w-40, or if you need a Higher viscosity oil try Mystic JT8 20w-50,.............