Generally speaking, regarding the drivetrain, what is the biggest

Depends totally on the vehicle in question.

>>17175152
The one in your pic wil chew through its timing chain guides before 100k and will have to be pulled to fix that shit, since the timing components are at the back.

>>17175176
Is the B6 S4 the only model with that issue? What about the RS4/6?

>>17175192

The all have the same issue to a degree, since they all have cam chains.

>>17175238
The B6 is the only one I head people bitching about. Are the chains located in the rear on the other model years? I found a decent deal near me with low mileage and I'm trying to get an idea of what I'm getting myself into. Replacing every single component is looking like it'll run around $5300, but that's buying them all individually. I haven't looked into the kits yet. I'd imagine if I replaced the guides before they broke that I could reasonably get away with not replacing some of the components.

>>17175192
B7 shares the same engine.

if my dream car needs an engine rebuilding after 200k miles i would talk to a therapist about my shitty dreams.

>>17175192
RS4 is fine since it uses slightly different components. I don't trust the S5 either, but the RS5 should be okay.
S6 and RS6 use different engines and I haven't heard complaints about those yet.

>>17175152
I had an audi, it got to125k and completely shit itself and I spent more money keeping it running than it cost me to eventually sell the POS finance my car that I'm still driving today.

Back on topic:
>If you found your dream car at the perfect price, but it had 200k miles
That right there is why you're going to fail, hard. Because when I buy a car the price I'm willing to pay is determined by the make, model, condition and mileage. It is impossible for a car to be the perfect price and 50k more miles on it than I'm comfortable with. What you're describing is car that is overpriced for its condition.

Should I buy an rs4 here in Nederlandistan for 54.000 thats has 60k km? Its everything I need and want and the 56000 euro price is not the problem

>>17175780
Seems high but I don't know the market there. I found one for $10k USD with 40k miles. Really thinking about it.

>>17176835
An S4 not an RS4

What about a w221 with 170-200k km on them, what problems should i expect?