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Author Topic:   Two-Cycle Engine Oil Additives

grocks posted 04-25-2010 12:36 AM ET (US)
[Are two-cycle oil additives recommended] in older two-cycle outboard motors? If so, what should I use? Does [the additive] get added to the oil gas or both? [H]ow often?
pcrussell50 posted 04-25-2010 01:48 AM ET (US)
I wouldn't. If the piston, rings and cylinder are healthy, nothing you can add will make them more healthy. If they are not healthy, nothing you can add will stop their eventual demise, short of an overhaul. The good news is, outboards are easy to overhaul... especially older ones.
There are a surprising number of older outboards whose pistons, rings, and cylinder walls are perfectly good, only they aren't running because their owners don't know how to troubleshoot the very simple fuel and ignition systems. A little tune up, and they can and will run for hundreds of hours like new. I have one like that. A 1959 model Johnson Super Seahorse 35hp. Aside from the old styling and the fact that it drinks fuel like drunken sailor, it might as well be right off the showroom floor in 1959.
-Peter
jimh posted 04-25-2010 11:53 AM ET (US)
I do not recall any additives being marketed which are added only to the oil in a two-cycle outboard motor. Most all additives for two-cycle engines are added to the gasoline.

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Author	Topic: Two-Cycle Engine Oil Additives
grocks	posted 04-25-2010 12:36 AM ET (US) [Are two-cycle oil additives recommended] in older two-cycle outboard motors? If so, what should I use? Does [the additive] get added to the oil gas or both? [H]ow often?
pcrussell50	posted 04-25-2010 01:48 AM ET (US) I wouldn't. If the piston, rings and cylinder are healthy, nothing you can add will make them more healthy. If they are not healthy, nothing you can add will stop their eventual demise, short of an overhaul. The good news is, outboards are easy to overhaul... especially older ones. There are a surprising number of older outboards whose pistons, rings, and cylinder walls are perfectly good, only they aren't running because their owners don't know how to troubleshoot the very simple fuel and ignition systems. A little tune up, and they can and will run for hundreds of hours like new. I have one like that. A 1959 model Johnson Super Seahorse 35hp. Aside from the old styling and the fact that it drinks fuel like drunken sailor, it might as well be right off the showroom floor in 1959. -Peter
jimh	posted 04-25-2010 11:53 AM ET (US) I do not recall any additives being marketed which are added only to the oil in a two-cycle outboard motor. Most all additives for two-cycle engines are added to the gasoline.