Transmission service
09-06-2016, 04:25 AM
#11
AudiWorld Member
"but I'm guessing most service depts won't pay too much attention to the temps when doing this service. "
Consider, if that is 95F. If the shop lets their cars cool down after the customer arrives, the old fluid will come down to ambient temperatures, and the transmission itself should cool with it. Making this a non-issue IF the cars are given time to settle down.
When the new fluid is added, it will typically be at shop temperature, which might be 60F-90F depending on where the shop is and how brutal it is allowed to get, but for many shops the required temperature range would simply be within the range that the shop is normally kept at. Again, often making it a non-issue.
So depending on your shop, they may or may not be in the habit of checking temperatures. Or, may not need to.
Of course, if your local Audi dealer runs an open-air shop in the jungles of Borneo...(G)...
FWIW.
Consider, if that is 95F. If the shop lets their cars cool down after the customer arrives, the old fluid will come down to ambient temperatures, and the transmission itself should cool with it. Making this a non-issue IF the cars are given time to settle down.
When the new fluid is added, it will typically be at shop temperature, which might be 60F-90F depending on where the shop is and how brutal it is allowed to get, but for many shops the required temperature range would simply be within the range that the shop is normally kept at. Again, often making it a non-issue.
So depending on your shop, they may or may not be in the habit of checking temperatures. Or, may not need to.
Of course, if your local Audi dealer runs an open-air shop in the jungles of Borneo...(G)...
FWIW.
09-06-2016, 10:29 AM
#12
AudiWorld Super User
So that's what kept me up last night!
No, really. I'm foolishly relying on Audi's recently improved reputation for quality, and foolishly assuming the automated fill process was done properly. And since there are no puddles under the car and I don't bottom it out on rocks (yet) I'm also assuming it hasn't leaked away. At least it is not like old Triumph motorbikes, with a vertical gasket and seal on the oil pan, guaranteed to leak.
And, that's under warranty.
No, really. I'm foolishly relying on Audi's recently improved reputation for quality, and foolishly assuming the automated fill process was done properly. And since there are no puddles under the car and I don't bottom it out on rocks (yet) I'm also assuming it hasn't leaked away. At least it is not like old Triumph motorbikes, with a vertical gasket and seal on the oil pan, guaranteed to leak.
And, that's under warranty.
10-05-2016, 02:30 PM
#15
AudiWorld Super User
Rear is typically the easiest to change. Front and rear should be same fluid, but center is Torsen so originally comes with the magic Sturaco additive elixir what like triples the price. But see below--both on the procedures and the fluids.
Be careful on several fronts. This is not a 69 Chevy or a Suburban.
1. Never drain a diff until you have the fill port confirmed and open. Shortcut here = possible flatbed.
2. Get under there and really know where the ports are. Do not just "assume" it and do not be surprised if either the center or front diff ports are essentially unreachable. Don't assume all the Q5 motors are even set up basically the same, and definitely don't assume the 6 and 8 speeds are the same either. Rears are pretty American iron low tech even with half shafts, but not front or center diffs. For example on 6 speed D3 4.2 A8's, the ports are essentially useless, especially for center diff. The D3 S8 and and W12 are very unusual corner cases due to one off and little known ability to drop an inter-tied gear oil cooler. I have not checked the 8 speed in either the D4 or the Q5, and my Q5 is hybrid so may be yet another flavor on diffs. 5 speed forward diff fill port on C5 was essentially inaccessible unless whole CV axle AND stub axle output shaft was pulled. As in, see #1.
3. Be sure you know what you are doing on the Sturaco and the Torsen. It is in the spec'ed center diff fluid from the dealer. But, instructions on this vary. Per ZF at least on the six speeds, you don't use it for a drain and fill, but only use on a rebuilt with a fresh fill if shipped dry. And if you do, it may lose the benefits of Torsen and you get kind of a low line open diff result. Thus the best intentions of fluid service can lead to loss of the benefits of Torsen. And you would not find out until you get stuck in mud or snow. Yet another tow truck scenario...
Be careful on several fronts. This is not a 69 Chevy or a Suburban.
1. Never drain a diff until you have the fill port confirmed and open. Shortcut here = possible flatbed.
2. Get under there and really know where the ports are. Do not just "assume" it and do not be surprised if either the center or front diff ports are essentially unreachable. Don't assume all the Q5 motors are even set up basically the same, and definitely don't assume the 6 and 8 speeds are the same either. Rears are pretty American iron low tech even with half shafts, but not front or center diffs. For example on 6 speed D3 4.2 A8's, the ports are essentially useless, especially for center diff. The D3 S8 and and W12 are very unusual corner cases due to one off and little known ability to drop an inter-tied gear oil cooler. I have not checked the 8 speed in either the D4 or the Q5, and my Q5 is hybrid so may be yet another flavor on diffs. 5 speed forward diff fill port on C5 was essentially inaccessible unless whole CV axle AND stub axle output shaft was pulled. As in, see #1.
3. Be sure you know what you are doing on the Sturaco and the Torsen. It is in the spec'ed center diff fluid from the dealer. But, instructions on this vary. Per ZF at least on the six speeds, you don't use it for a drain and fill, but only use on a rebuilt with a fresh fill if shipped dry. And if you do, it may lose the benefits of Torsen and you get kind of a low line open diff result. Thus the best intentions of fluid service can lead to loss of the benefits of Torsen. And you would not find out until you get stuck in mud or snow. Yet another tow truck scenario...
Last edited by MP4.2+6.0; 10-05-2016 at 02:40 PM.
Thread
Thread Starter
Forum
Replies
Last Post
LexusLSguy
A8 / S8 (D4 Platform) Discussion
28
02-15-2017 03:39 PM
gideon-sf
Audi allroad
2
07-18-2009 10:45 AM
TwisTTer
TT (Mk1) Discussion
2
10-04-2002 09:28 AM