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Old 11-14-2012, 06:15 AM
Pierre Louis Pierre Louis is offline
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Location: US
Join Date: Oct 2011
Posts: 927
Mein Auto: BMW
Originally Posted by BMWTurboDzl View Post
Per ZF with regards to all passenger AT severe service is 8 yrs or 80k-120k KM where vehicle was operating in " frequent hwy driving in top speed range", "offensive,sporty driving style","frequent trailer operation".

The conversion to miles 48k to 72k.

Something to keep in mind is that these new units are holding up very well under normal maintenance. You just don't hear about failures from used car owners.

Sent from my MB525 using Bimmer App
So, uh, how would you explain the reality of the original post in this thread - how nice the color of the fluid is in "<30,000 miles"??

48k to 72k sounds reasonable, though, given ZF's advanced design adaptive to the quality of the fluid, and, IMO, how most of us drive.

Reality is different than what a marketing department at ZF or any other manufacturer suggests. There are compromises at every step of automotive manufacturing, and automatic transmissions have been somewhat of a disappointment in reliability if you haven't noticed.

Driving like a European driver, with the kind of care they have historically given (remember how beloved Fiats were in Europe when they were trash in the US) is almost totally different from what I affectionately call the "stoplight grand prix" here in the US. High speed driving and long stretches with a locked up torque converter doesn't translate to frequent high torque shifting and gear changes in stop and go driving. Its just a matter of judgement on how to define heavy duty use.

So as I said, buyer beware. My experience has been to change the fluid at least within 30-60,000 miles on traditional planetary gear type automatics. Even DSG's or "auto-manuals" like the one VW has call for 40,000 mile fluid changes.


Last edited by Pierre Louis; 11-14-2012 at 06:23 AM.
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