Should you change Transmission oil for Mercedes Benz S Class W220 at 70000 miles?
W220 S320 2001 I changed transmission oil at 65,000 miles and
see an noticeable difference in smoothness of the shift. The oil
was of chocolate colour and had a distintive smell to it. I believe
that transmission oil should be changed at 60,000 miles.
auto transmission oil should be changed every 40,000 - 50,000
Kms or 25,000 - 30,000 Miles no mater what vehicle it is as oils
only have a limited life span. The oil should be changed before it
get to the chocolate colour as it then indicates the clutches in
your transmission are burning and not engaging properly causing
Per the service booklet for your W220 on page 15, it should have
been changed at 40k miles from new. If you have not had it done
yet, your vehicle has not been serviced correctly, and you should
take it to a different garrage!