Alright... the marina know-it-all stopped by the other day to share a bit of his wisdom. At some point he informed me that I had to put an additive into the gas that these older engines needed because of the lack of lead. Dealing with engines this old is new to me, so what he is saying could be true. But, it sounds like a bunch of bunk to me. Should I be putting some sort of lead substitute additive in when I fuel uop?