Originally Posted By: aquariuscsm
Or according to BMW,maybe PP 5W50/M1 5W50,15W50/Syntec 5W50
If Castrol High Performance Synthetic Oil is not available and you need to add oil between oil changes, only use synthetic oils with the following specifications for M vehicles:
Viscosity - preferred SAE 10W-60
Alternative - SAE 10W-40, SAE 5W-50 or SAE 10W-50
His is a post 03/00 car (like mine), it takes BMW 5w30, PU 5w40 or M1 0w40.