I have overfilled my 2.5 vw engine at two quarts because I had a five gallon 15w40 pail once, at two quarts over it started burning to the point there was light blue smoke coming out the exhaust, it stopped after one quart was burned, not sure why it started burning oil at 2 quarts over. I have overfilled .5 to 1 quart at most, and no complications. There shouldn't be any issues because its not that much oil, the pan holds 6 quarts. even at 6 quarts the whole pan isn't full, but almost is (I know this because I have dropped the pan due to gasket leaking, and filled it up with 6 quarts and there was still room for another quart).