I've been running Delvac 1300 15w40 for the last 3 years. Do you think the M1 10w40 HM would be better for my inboard ski boat. It's a 5.7L MPFI engine - Typically 50F-95F outside temp during our ski season. Not unhappy with my oil choice but always wondered if that stuff is too thick at startup. I let the engine warm up 2-3 minutes before we hit the course.
thanks!
thanks!