Quote:
Originally Posted by The_Laird
I'll refer to my original advice which was to get it done professionally by someone who has the equipment to flush it properly. There are plenty of citings here about gearbox failures after an amateur fluid change, usually thought to be due to 'distrubing the sludge'. I'm not a gearbox expert, but I'd guess that mixed transmission fluid is not a good idea.
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When I had a lengthy conversation with a tech guy from ZF, he said that it simply isn't possible to "flush" the transmission due to the design as there will always be fluid left in the TC.
If you have a good knowledge and experience of mechanics, a drain and fill procedure is really quite straight forward. If you have actually been through the process you'll see that (in my case anyway) it's not actually possible to disturb any "sludge" as all the contamination is being removed from the sump when it's taken off and cleaned. Anything else will be inside the transmission and out of reach of the localised work that's being carried out.
If you think about it, the internals of the transmission are draining every time you turn off the engine, the only difference with a drain and fill is that you're changing the fluid.
I would have had the same issue if anyone else had carried out the service and would have had to pay them for the same outcome. The long and short of it is, it didn't have the ZF/Audi fluid in the transmission and so inevitably the 2 fluids mixed which is why I think I'm now having problems. I unfortunately couldn't tell what fluid was in there before the procedure was carried out and anyone else doing the work wouldn't have been able to tell either.
I wonder if the filter screen on the TC clutch solenoid is partially blocked?
I'm looking for some useful input by other mechanically knowledgable people who may have had the same experience as me. I can't believe an Audi garage (York Audi) put a non genuine fluid in.