I just purchased mine and have been catching up on deferred maintenance. Parts seem to be priced pretty similar to my other European cars. The only difference is I have more room to replace everything. I don't see how it would be any more to maintain than your average A4 to 3er. But then again I have a pretty common and simple 6cyl and a good old fashion manual trans.

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03 3.0i mt
89 325is