I have owned several outboard motor boats over the years. Some years I’ve had overlaps where I suddenly had three boats instead of the usual two on my property. To keep all of them in tip top shape I use Yamalube 2M oil.
After a couple years of buying Yamalube individually, I finally sat down and crunched some numbers. It worked out that buying Yamalube oil in bulk was the better way to go. I saved money and time, plus I rarely have to worry about running out of oil.