Hi, I got a headace problem on my e46 engine, I services my car on 02/04/2008 and the mechanic fill up 4.5L Mobil 1 5W-50 engine oil for my engine. Until now, I already top up the engine oil for another 4L for 3 to 4 times whenever engine light on (yellow color) after I shut off engine. I need help and advise on this matter.