Thanks for allowing me to join and ask my question. The pictures are my Snapper RER with 10HP Briggs engine. An oil leak developed after an oil change. I assume retightening the drain pipe caused a hairline crack to develop. I can observe the oil coming from the casting at about 3 to 5 seconds per drop. I cannot see any crack but am confident that is where the leak is coming from. By jamming a piece of plastic up against the casting I can stop the leak. A suggestion for a better way to deal with this without removing the engine would be greatly appreciated.