Previously I had a BMW E46 and after starting the engine in the first few seconds strange noises. Clacking of hydraulic lifters. Apparently the BMW inspection oil had no particularly high viscosity. It was an approved oil, which BMW sold expensive than workshop inspections. A 5W-thirtieth Then again made oil changes and administered this oil and after a few days the noise was gone !!! Not without reason is Mobil1 THE TASTSIEGERÖL, ideally by very low viscosity and high temperature resistance for all applications is. Outrageous, I find that BMW 1 liter of poorer oil 5W-30 for 24 euros per liter (!) Sold, but no longer with me! Would recommend this Mobil1 oil, making the oil change itself. I have now bought a BMW M1 and I'm going to give my B-turbo engine the best!