I've read that too much engine oil can damage your engine, however I've also seen mechanics suggest you should just let excess engine oil burn off with driving so it's 'nothing to worry about'. These seem a contradiction of statements.
When do you know whether to let it burn off and whether to drain it? I'm assuming they mean if it's a bit over it's not a problem. If so would a few mm or 1l be too much or too less etc.