I get about a quarter size oil drop from the trans passenger side bellhousing when the car sits overnight. I?m almost positive it?s the rear main seal. I?m in the process of moving to a house with a garage later this summer where I plan on pulling the engine/trans and replacing the rear main seal and oil pan gaskets along with maybe a fresh head gasket. I?m wondering if a short term solution would be some oil additive to swell the rear main seal and slow or temporary stop the leak. I replaced my flame trap when the valve cover gasket leaked this winter, now it?s leaking from between the engine/trans. Has anyone had any sort or luck with these seal conditioners?