B
Bob Middleton
The M-18 engine manual states that the oil should be 30W HD (CD) and different "types" of oil should not be mixed. My question is how important is it do not mix different oils? My quess is that many people buy used boats and never know the kind of oil used by the previous owner. Are we actually talking about the oil itself i.e., 10W30 vs 30W or brand names i.e., Shell vs Mobil? Thanks,