FYI Some good Transmission tips

[HPIA4v2]

Originally Posted by bsprtsgrp

I just called ZF USA in IL. and spoke with a technician there regarding this very issue. Just a note: I actually called them prior to reading this thread as I was contemplating doing a tranny fluid change and wanted to get the manufacturers recommendation first.

His recommendation regarding this topic (at my 75k mileage) was "the transmission should be serviced". I asked him about BMW's Lifetime fluid statement and he said it's more about BMW's "Maintenence Free" marketing than anything else. He said if the fluid is not discolored and does not smell burnt or has excessive sediment then there is no harm in a drain/filter/and re-fill. He did recommend staying with Esso(Mobil) 71141 or ZF Lifeguard #5

He said if the fluid is dark and smells, then there are other issues with the transmission going on.

Just thought I'd pass this on....

Just an observation, I just did another drain/fill on my trans last weekend @76kmiles (2002 ZF trans). this time I noticed the coloration is more of thick Chinese tea; while at 42kmiles (drop the pan and filter) the color was more like Coca-cola and metal shaving suspended, you can search my post on that one.

From this experience, I believe if you want to flush the fluid do it early w/ filter and forget the second time around altogether (it's diminishing return IMHO).

I am planning doing it on my 535i 6-sp ZF trans next month @35K on the odometer and maybe never have to do it again until I sell the car.

TRemember there is a California store that carries ZF-5 and ZF-6 fluid so no guessing game no more(The CTSC - ZF Parts), if you want to do it do it right.