This should probably be posted somewhere else but here goes. I have an eratic miss with my 2000 50hp mercury. last ni9ght I decided to pull the fuel pump and carbs to check them out. I pulled the 2 stroke oil tank off the engine, wondering if i should keep the oil or not I decided to dump it, while draining it into an oil bucket, it was draining so slow that I opened the cap to vent it better, to drain faster. I looked inside the tank and the strong smell of ammonia bout knocked me on my *****. I opened a new container of Merc 2 stroke oil and while that smell is there it is no where near as strong as the engines oil tank. Question does this oil have a shelf live once opened and put in the engines oil tank. I have been using 2 stroke oil since the late 70's in chain saws but of course that does sit around long, we can go through 2-3 gllons or more per day, so I have never thought about how long it is good for.
