1987 Mercury 70hp premix oil

[brooksville_rebel]

Finally got the new engine on the pontoon.(old one seized up while out on the water) Its a 1987 3 cylinder 70hp Mercury. The oil mixer has been removed from it so now searching for the "best" oil to mix with the gas. I emailed Mercury and got a reply just saying to use a 50:1 ratio. With this old of an engine is there a specific oil to use ? Synthetic or not ? The ones touted as High performance ? Little confusing as other than my weed wacker haven't done mixing before.
Thanks
Mark

 

[flyingscott]

Any oil rated tcw-3 mixed at 50-1 will be fine for your motor

 

[RCO]

You are bound to get lots of opinions any time you ask about oil. As mentioned above anything with the TCW-3 rating will be fine. I like to use the factory Merc oil. It seems to smoke less and smell better to me, and is only a few bucks a gallon more than the generic stuff.

 

[brooksville_rebel]

Thanks for the input.

 

[MH Hawker]

i use the walmart super tech brand at 12.50 a gallon, in a older motor, its going to smoke no matter what you use, add a bit of sea foam ever now and then to clean the fuel system and float on

 

[444]

Mine's a 1978 merc 175hp. I've always run the cheap marine 2-stroke oil in it. I figure it's got to be the closest to what this thing was designed around back in the day. I've tried the mercury brand stuff as well. Didn't find any difference. I have not tried the synthetic. With the premix you go through more of it than with the injection system so keeping the cost down can be helpful.

 

[bwhalerman]

Finally got the new engine on the pontoon.(old one seized up while out on the water) Its a 1987 3 cylinder 70hp Mercury. The oil mixer has been removed from it so now searching for the "best" oil to mix with the gas. I emailed Mercury and got a reply just saying to use a 50:1 ratio. With this old of an engine is there a specific oil to use ? Synthetic or not ? The ones touted as High performance ? Little confusing as other than my weed wacker haven't done mixing before.
Thanks
Mark

I run a 1988 70hp 3cyl 2 stroke and use the Mercury Synthetic oil. Haven't noticed any difference.