Originally Posted by James Sonne
Well cars have oil pans for a reason, to keep excess oil from spilling out of the engine. I really can't imagine anything GOING WRONG with even a quart of extra oil.
There's only one thing wrong with your statement.... Facts! All modern engines have non-vented/closed crankcases. If the engine is over serviced it can build up too much crankcase pressure and blow seals... Usually a rear or front main (Crankshaft) seal. And that I would call damage! :?