I've left an engine full of vinegar soaking for as long as a week before without any issues whatsoever. This was only done after an acid wash (which was the best thing I've ever done for this engine) after several months. I now do an vinegar flush every year or so just to keep the gunk out and leave it for as long as a week.
So far, so good...
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1979 C&C36 'Dionysus'
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