Re: 1968 mercury TWO OR FOUR STROKE?
No four-stroke Mercs back then so it's a two-stroke. All you need to do is start it to tell. Two strokes of that era needed a fuel/oil mix. If it were oil injected, you would find a container into which two-stroke oil would be added. None of those on your engine either. Use TCW3 outboard oil. You can buy CITGO, WalMart, or any of the discount brands for $7.95 to $10.95 a gallon or you can buy Merc oil for $20 a gallon. It's all TCW3.
