hi,recently juz bought an E36 318i yr 92.when i send her to workshop for minor service,my mech tell me tat the g/b oil is very dirty (not black but red),shud i change the g/b oil?which brand is best for?how much issit?thanks in advance.
Changing ATF and the filters should be enough....flushing is an expensive option that should be exercised once in a while. No need always flush lar. ATF for normal change should be around 5 litres.