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I'm not sure what is specified, but personally I'd want to do a full 7L, which is what I do each time I change my ATF. It is more work since you can only do about 2L at a time and must row the gears to get fluid exchange to occur. They can pressure flush it, but I advise against that as it can damage the internals. Since your car is 6 years old and is out of warranty, you should consider doing the service yourself at home. I made a thread in the DIY forum on how to do this, it's a bit time consuming but pretty straightforward.
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