The rear main seal is a common source of oil leaks. If you notice oil drops accumulating at the bottom of the engine where the transmission mates, you likely have a leaky rear main seal (also known as a rear crank seal.)
This a genuine BMW original part. Kit includes all new bolts with thread lock applied, new metal gasket, and a new rear seal housing with seal already pressed in place.
BMW Part Number: 11141438274
Fits all M52TU and M54 varients.