What is the best Ethenol additive for my engine? I have a 1985 Force 85HP O/B. I'm not having any problems right now, but don't want any. I'll be heading up the lake later today & want to get the best additive for my engine. Is there a real difference between the different brands of additives? If there all basically all the same I don't want to pay extra for just a name brand. Thank You for any advice. MAXX