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Transmission Flush Opinion Question - Should I or Shouldn't I?

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Transmission Flush Opinion Question - Should I or Shouldn't I?

 
Old 02-19-2018, 12:08 PM
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Default Transmission Flush Opinion Question - Should I or Shouldn't I?

Bought an 06 with 200k miles on it and the transmission jumps between 3rd & 4th when cold. I feel like the fluid level is low but have changed fluid on a high mileage car in the past and the transmission was never the same so I'm a little gun shy. Add to that the cost of fluid brings a change to $200+ and I'm more than a little gun shy. I'm wondering if anyone has done a fluid change with high mileage and had any issues. I've read through the threads on best type and the procedure but haven't seen much posted in a while on the issue. I also think it shifts weird generally so hoping clean fluid would help there as well but I'm really worried I'm going to cause more trouble than I fix.
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Old 02-19-2018, 12:59 PM
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Trans flush ruining old high mile trannyís was something that affected old school units with lead based friction materials. Basically new fluid with its refreshed detergents would wash loose all the bits of crud and screw the trans.

Newer trans types like in the A8 donít have lead based friction materials, so donít build up anywhere like the sludge they used to. Therefore new fluid doesnít really have anything to wash loose and screw things up.

At your mileage a fluid and filter change would be very beneficial and certainly wouldnít do any harm. If budget a concern, use Redline D6 ATF. Identical to the snake oil $$$$ VW/ZF branded stuff.
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Old 02-19-2018, 03:15 PM
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Agreed with dvs_dave generally.

Don't kid yourself BTW that it might blow up anyway either way. That is, often folks change fluid when tranny is heading south already. Like kind of issues you describe, then two weeks later it fails. Fluid? Most likely no, it was already dying. Like taking your baby aspirin or statin after the first heart attack, and then you have another one. Blame the meds? Nope.

Fortunately the 6 speed ZF's have been pretty darn reliable. Very few reports of outright failures over many years now. First step is typically filter and fluid change. And yes, sometimes fluid level is just off and it then starts shifting subpar. After fluid change, you can look at other deeper dive internal items if need be.
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Old 02-19-2018, 07:36 PM
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It's a sealed unit, how can the oil be low? Vaporized through seals? Oil vaporizes? If it's dead, it's dead. Sometimes I don't understand the logic with flushing. How about the solenoid that's responsible for 3-4 gear, if there's such a solenoid, since I've seen tons of them on the tranny.
Cheers,
Louis
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Old 02-20-2018, 07:47 AM
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Originally Posted by dvs_dave View Post
Trans flush ruining old high mile trannyís was something that affected old school units with lead based friction materials. Basically new fluid with its refreshed detergents would wash loose all the bits of crud and screw the trans.

Newer trans types like in the A8 donít have lead based friction materials, so donít build up anywhere like the sludge they used to. Therefore new fluid doesnít really have anything to wash loose and screw things up.

At your mileage a fluid and filter change would be very beneficial and certainly wouldnít do any harm. If budget a concern, use Redline D6 ATF. Identical to the snake oil $$$$ VW/ZF branded stuff.
Thanks I was hoping things had improved since then. Best I've found on Redline is $145 for 12 quarts. I can't imagine what the zf brand stuff would run.

Originally Posted by MP4.2+6.0 View Post
Agreed with dvs_dave generally.

Don't kid yourself BTW that it might blow up anyway either way. That is, often folks change fluid when tranny is heading south already. Like kind of issues you describe, then two weeks later it fails. Fluid? Most likely no, it was already dying. Like taking your baby aspirin or statin after the first heart attack, and then you have another one. Blame the meds? Nope.

Fortunately the 6 speed ZF's have been pretty darn reliable. Very few reports of outright failures over many years now. First step is typically filter and fluid change. And yes, sometimes fluid level is just off and it then starts shifting subpar. After fluid change, you can look at other deeper dive internal items if need be.
I don't think it's dying per se but it definetly needs some attention. I bought it from up north so not sure if the climate change is playing a factor in it all as well.

Originally Posted by ltooz_a6_a8_q7 View Post
It's a sealed unit, how can the oil be low? Vaporized through seals? Oil vaporizes? If it's dead, it's dead. Sometimes I don't understand the logic with flushing. How about the solenoid that's responsible for 3-4 gear, if there's such a solenoid, since I've seen tons of them on the tranny.
Cheers,
Louis
I get the sealed unit thing but who knows what the prior owner did. I'm guessing the fluid was changed prior and maybe not filled correctly. If I had this issue with another car I would just add fluid and move on. I've seen the solenoid's mentioned in other threads but I don't have any experience with those as far as diagnosing or replacing them. I do have the VCDS coming so if there is a way to trouble shoot it through that I'm all ears.
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Old 02-20-2018, 04:15 PM
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I think you should start reading about mechatronix, you may be the first person who solves this problem, make sure to document everything since all I see up here is flushing stuff and after the flush, people disappeared because they had to sell the car.
Cheers,
Louis
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Old 02-20-2018, 10:10 PM
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Originally Posted by ltooz_a6_a8_q7 View Post
It's a sealed unit, how can the oil be low? Vaporized through seals? Oil vaporizes? If it's dead, it's dead. Sometimes I don't understand the logic with flushing. How about the solenoid that's responsible for 3-4 gear, if there's such a solenoid, since I've seen tons of them on the tranny.
Cheers,
Louis
Itís not all that unusual for the pan gasket to leak, and it doesnít take much before shift quality is affected.
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Old 02-21-2018, 06:59 AM
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Originally Posted by dvs_dave View Post

Itís not all that unusual for the pan gasket to leak, and it doesnít take much before shift quality is affected.
+1
Or the o-rings on the trans cooler.
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Old 02-21-2018, 07:17 AM
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Great, now VCDS experts should show everyone how to check the oil level of the trannie since it's heavily electronically controlled. I'm sure it has sensors everywhere.
When it's specific on a certain gears only, chances for the flush to fix are not great logically.
Can some flushing experts pretend to fill up with 1/2 quartet short to experiment how bad the tranny perform please? If I have to do it, I would but I don't believe in it.
Cheers,
Louis
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Old 02-21-2018, 07:41 AM
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Originally Posted by ltooz_a6_a8_q7 View Post
Great, now VCDS experts should show everyone how to check the oil level of the trannie since it's heavily electronically controlled. I'm sure it has sensors everywhere.
When it's specific on a certain gears only, chances for the flush to fix are not great logically.
Can some flushing experts pretend to fill up with 1/2 quartet short to experiment how bad the tranny perform please? If I have to do it, I would but I don't believe in it.
Cheers,
Louis
You used to offer constructive contributions. Although now your posting style has become a lot like that know-it-all curmudgeon s4master1 who fortunately no longer contributes. Too bad....

Last edited by dvs_dave; 02-21-2018 at 07:45 AM.
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