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Apparently putting too much oil into your airplane engine is really bad and can be expensive but why? Will the excess oil go out via the oil breather,... ? Thank you

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    $\begingroup$ Same reason as car engines - mechanics.stackexchange.com/questions/24679/… $\endgroup$ Dec 6, 2020 at 17:51
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    $\begingroup$ Nothing bad happens. It just blows out all over your belly. For example, my Cessna 210 maintenance manual says to add 10 qts of oil when you do an oil change. If we do that 1/2 qt goes to the filter and 1 1/2 qts get blown overboard on the first flight. So we add 8 qts and then keep it at 6-7 quarts after the first flight. $\endgroup$
    – JScarry
    Dec 6, 2020 at 19:15

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