SMART-O REUSABLE OIL DRAIN PLUG, M18x1,5 with gasket
 
Defective thread - here is the solution
 
This oil drain plug has integrated a high performance seal

The SPECIAL O-ring material expands automatically when in contact with engine oil.
This seals the oil pan from the interior of the crankcase - The bolt is reusable 
 
Fits BMW R2V K2V K4V models