Hi:<br /><br />I have a 1965 Merc 650, 65 HP, 4 cyl. The mixing bottle I just got from "West Marine" says on the bottle "Mercury prior to 1966 use 24-1 ratio" I keep hearing about the 50-1 ratio and was wondering if I was adding to little oil to the mixture. I thought this was a lot of oil (24-1) to add, but why is this on the mixing bottle in bold print? Does this sound correct? The former owner told me he used the 50-1 mix, which I'm beginning to wonder about.<br /><br />Any thoughts?