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I went with the T6 5w40 full synthetic. The engine is noticeably easier to spin by hand now; and the starter is able to spin rather faster than it could before, which makes a big difference to starting - the engine starts first attempt now, even when fully cold soaked. Thanks for the help!

a Yamaha 25II; she's one of the smallest inboard sailboats i've ever seen, and it makes her a great pocket cruiser. i keep her on lake union in Seattle and aspire to cruise the San Juans in a year or two! thanks! i missed that T4 and T6 have the MA rating, those sound like the way to go. i'm...

i have a 1977 yanmar YSB8 in my sailboat; I had been using up a small stash of old Delo 30W rated CF that came with the boat, but I haven't been thrilled with starting performance in cold weather. the engine starts great in the summer when it's over 50F or so (and starts very easy in our 95F...