Thousands of engines get their drain bolts over tightened everyday too. Eventually, threads strip. So your gold standard of maintenace is quick lube places?Every car in the fleet runs a quart over.
It’s quite common to run 1/2 to 1 quart over spec. Hundreds of members here have been doing it for years. I’ve yet to hear of even one failure due to a little extra oil. Thousands of engines get overfilled at lube joints everyday. The manufacturer's leave a margin for error for this very reason.
