To be perfectly honest i am a bit of an expert when it comes to lubrication i smeer it on things all the time so i strongly recomend durex chocolate flavour when it comes to oral if you get my jist...
If you overfill the engine oil you can damage the engine. The crankshaft will make contact with the oil causing it to form a froth of oil and air which is a poor lubricant.
It depends how big the leak's hole is. If it's small you can seal it with a strong type of wax that may need to sit for about a day or so. but if 's a wide crack in the side, you may need to replace...