Hi BMWTurboDzl. I'd be interested in some links to BITOG showing UOA on the ZF 6HP26/28 transmissions. Been doing some searches and not finding much there.
Originally Posted by BMWTurboDzl
Got to BITOG
I have ran across this:
It's from a BMW 760, which it appears for that year to have a ZF 6HP26 (http://www.e90post.com/forums/showthread.php?t=379223) which is very similar to our 335d transmission. That fluid was a mess at 70k.
Also found this:
Skip Miller had his transmission flushed recently and sent the original fluid to Dyson Analysis to see how well it had held up. Skip's comment when seeing the report was "Results were not pretty." He had 78,000 on his 2003 XKR at the time of service; the report may be reviewed at max performance cars dot com under the topic "ZF 6HP26 Transmission Fluid Analysis and Fluid Change," dated "2008/05/04."
Based on this information Skip now prefers a much shorter service interval of 20K
2011 335d Sport Package/Cold Weather Package
2004 Ram Cummins with lots-o-mods
1990 YJ Repowered with modified Cummins B3.3T