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Go Back   SailNet Community > On Board > Gear & Maintenance
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Old 09-03-2011
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Extra Oil OK?

Didn't have power at the house today, we got it this pm, so decided to go sailing.

The outboard 9.9 Merc 2 cycle was out of gas. I had a 5 gal can full of gas that I was 90% sure I had mixed the oil in but I was not positive.

I added oil again so now the 6 gal tank probably has twice the concentration of oil 1 to 25 instead of 1 to 50.

I looked it up in the book and doubling the oil is recommended for break-in and for immersion so apparently it does not hurt anything.

Anyone agree or disagree.

I've have to come up with a labeling system so I know for positive which tanks have oil added.
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Old 09-03-2011
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May smoke a bit more than usual, but should be fine. If it starts running poorly, try cleaning the plugs.
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Old 09-03-2011
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have lots of plugs
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Old 09-03-2011
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Much better than less oil. Won't hurt your motor, just smoke a lot more. Nothing to worry about.
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Old 09-04-2011
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I have read the theory that more oil actually makes the mixture leaner as the extra oil displaces some of the fuel. Same flow through the jet, same amount of air, but less fuel. Not sure how much more oil it would take to be harmfull? If the manual says 25:1 for break in is ok it is probably OK. However, I think most break in instructions also call for reduced RPM's for the first hours.

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Old 09-04-2011
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Quote:
Originally Posted by davidpm View Post

The outboard 9.9 Merc 2 cycle was out of gas. I had a 5 gal can full of gas that I was 90% sure I had mixed the oil in but I was not positive.
Next time, you can be 100% sure by checking the colour of the fuel before adding more oil.
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Old 09-05-2011
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I mark my 2 stroke cans. Thats all that goes in and I never guess. Too much oil will foul plugs and over time gum stuff up.
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Old 09-05-2011
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won't damage anything other than fouling the plugs if you run at low rpm or idle a lot. been there, done that. Just try to run her hard with some properly mixed fuel as soon as you can to "blow the carbon out", as we used to say.
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Old 09-11-2011
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Thank you all. I just run the engine at full throttle even in the harbor and finger piers. It's so noisy I can't hear what my neighbors are saying but they seem to be saying a lot and with gestures but at least my plugs will be OK.
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