Title says it all, is there a way to tell a rear main seal leak from an oil pan gasket leak. Noticed it today, right after I added some oil, dont know how much it leaks or anything, just trying to figure out which it is. I cleaned off the back of the pan, where its leakin, to see if it leaks overnight, or only if its runnin. Ive heard that if its just when its running, its teh rear main, any truth to this? Almost time for an oil change so might be a good time to take care of it.