E46Fanatics - View Single Post - Definitive answer on changing ATF in high mileage 330ci
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Old 06-10-2009, 10:46 AM   #44
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Join Date: Sep 2004
Location: Santa Cruz, CA
Posts: 279
My Ride: 03 325i sport
I just posted a conversation I had with a ZF-certified service guy this week (one of very few in the USA). We discussed high-mileage ATF changes, process and (non)issues like varnish. Have a read:


I don't think that the reasons FOR changing the ATF would be any different for the GM tranny. I have heard (though I would question the source) that high levels of metals-based contaminants flowing through high-mileage ATF exacerbates the solenoid failures that do occur in some model years of the GM tranny. Again, I can't substantiate that.

Last edited by Makakio; 06-10-2009 at 10:49 AM.
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