From Page 8 of the OMC manual for the 15HP, a 1992j model:
To protect your new outboard motor during the intiial hours of operation,
and to seat internal engine components, you MUST (emphasis theirs) add extra
oil during the break-in period.
The fuel/oil ratio for the first 12 gallons must be *25-1* (emphasis
theirs).
The fuel oil ratio during normal operation, after break-in, must be *50-1*
(emphasis theirs).
My 6HP manual in hand is just before they went to 100-1 oil. Note that
this, a 2005 manual, as the dealer didn't have a current one, is for the
normally 50-1 mix engine. My 6 is actually a couple of years later, and the
recommended use is for half of that shown above. As mine was a trade-in, it
didn't happen to have its original manual, explaining why I'm looking at an
older one.
It says, on page 15:
The fuel/oil ratio for the first 10 hours must be *25-1* (emphasis theirs).
The fuel oil ratio during normal operation, after break-in, must be *50-1*
(emphasis theirs).
HOWEVER...
"During high performance opertion you must use a *25-1* fuel/oil ratio in
your fuel tank."
Now, I agree, OMC is a poor source of information about what to use in their
engines for them to warranty them.
But until some more authoratative source presents, I'm going with the
manual.l NOTHING in it suggests, and, quite the contrary, demands its use,
for high performance, that doubling the oil is harmful to the engine.
Indeed, high performance seems to me to be more stressful, and, as such, if
the assertions that too much oil will melt the aluminum, that the
recommendation would be for LESS oil, not doubling it...
L8R
Skip
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