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July 15th, 2008, 11:03 PM
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 forumulations (and any good TCW3 oil for that matter) would be far superior to the Formula 50-D oil.
If anyone has any information where Mercury subsequently rescinded the above recommendation, please post a reply so we'll know.
July 16th, 2008, 07:43 AM
Petty Officer 1st Class
Re: Fuel-to-Oil Mixture Ratio for Older Mercury Outboards
Thanks for that post.It is very helpful to see it in print from the proper source.Ron G
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