Re: Fuel Mix
A bit more oil at 40:1 can't hurt the ol' gal. Check out the FAQ at the top of the repair forums' directories for Good Words on decarbonization of 2-strokes, highly recommended and will keep your Merc's rings unstuck and very happy.
Here's what Mercury had to say about oiling older Mercs:
Fuel-to-Oil Mixture Ratio for Older Mercury Outboards
________________________________________
Mercury Bulletin Number 80-6:
"A. USE OF FORMULA 50-D OIL IN OLDER MERCURY OUTBOARDS
Formula 50-D oil can be recommended (at a 50:1 mixture) for use in earlier Mercury outboards regardless of year of manufacture.
Formula 50-D also can be used in other brand outboards (at a 50:1 mixture), provided that the manufacturer recommends use of a 50:1 oil mixture."
The above was copied verbatim from a Merc Service Bulletins Microfiche.
Since this bulletin was issued over 20 years ago, I'd expect that Mercury's latest oil formulations (and any good TCW3 oil for that matter) would be far superior to the Formula 50-D oil.
A caveat to the above would be that this recommendation was made for production motors. If you are racing or operating a "racing" motor, you of course should run a much richer oil mix.
If anyone has any information where Mercury subsequently rescinded the above recommendation, please post a reply so we'll know.
Cheers..................ed
