I have some wd40 but where should i spray it to look for vacuum leaks and how will I know when I have found one?
also the MAF sensor is right next to the air filter - right?
E90 318i 2007 N46 2.0 Manual
E53 X5 2004 M54 3.0 Sport Auto
E83 X3 2004 M54 2.5 Auto