I was giving the jeep the look over today and the oil and all other fluids look good but i found something that worries me... I believe i have a slight rear main seal leak... My engine just fell out of warranty and now i have this to contend with... Ive changed a rear main on a 4.0 before but i really dont want to do it again to my jeep. What causes a rear main to leak? Are there any good "stop leak" additives that work? EEEEEERRRRRHHHHHHHHH! I need something more economical and trouble free!