I know nothing and thanks to KZread I truly think I saved my Bby 525i 2004 I change my own transmission oil and pump some new transmission oil in it got real well and also Change my own spark plugs, and coil packs only this I have no a/c I took it to fire stone they said it was my belt which I have with me and my truck Belt / 67305 Compressor reman and an ac recharge they talking around 1,691.92 I wish I can do that my self

I have the same model of car I can do this my self what’s this done for I never seen anybody feel up oil threw the back ?