Quote:
Originally Posted by diyanich
After first fluid flush (about 75% of Dexron IV was gone) I felt nicer shifts and shudder was just a vibration alike @ a t higher rate,but once cold it would shudder even stronger than before the flush--> low fluid level 'cause as soon as the temp was up it would shudder as I described above.
Then I brought it for the next flush and I gave a good description of all the symptoms and gave an example from Bimmerfest board,where guy topped up the fluid by himself after tranny flush done by the shop and was able to fill one more quart of fluid,so.....Yesterday I picked up my X and drove home,no shudder at operating temps and this morning,no shudder while cold.
Mobil Super MultiVehicle ATF LT 71141 made a difference and the tranny master mechanic was refusing the idea that the fluid would change anything,he admitted that the fluid made a difference.
I may be rush to be happy about the shudder absence,but for now I am happy not to feel that frustrating thing.
Will keep you posted.
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I think the key here for the OP and alluding to what JCL mentioned and what others have mentioned about fluid changes facilitating failure is the 2nd drain & fill. When I purchased my '06 3.0 (non-sport), I didn't have any transmissions issues. I'm just OCD and needed to do it to ensure (in my mind) that i'd covered all my bases and wouldn't hate myself if I didn't do it and it failed on me down the line.
When I did do the drain and fill, I replaced the filter, cleaned off the underside of the tranny that was exposed and the pan and magnet. Fitted the new filter, replaced the gasket and bolted it up. Filled it up with fresh Dex VI (Valvoline), ran it through the gears while stationary, took it out for a 15 minute spin on the highway and returned back to my garage. Filled it up a tad bit more. I then drove around like that for 2 weeks at which point I then drained all of the fluid out again and re-filled with fresh Dex VI. It's been almost 30K miles and I've had no issues whatsoever. Shifting continues to be smooth and as expected whether in normal or sport mode.
I think when doing the flush, as JCL mentioned, the new fluid with lots of new detergents clean the innards. If you just do it once and leave it in there, you're just circulating more dirt/debris, granted its pretty clean to begin with. The only thing I cleaned off was this thin layer black muck that builds up along the pan bottom and the magnet. I think that doing the second drain and fill accomplishes two things. One is it allows the cleaned out gunk to exit the tranny and two, it increases the concentration of fresh, clean fluid in the tranny. Any drain and fill will not get out 100% of the fluid as approx. 40% of it is still in the torque converter at any given time.
That's just my .02c adjusted for inflation.
