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Thinking about buying '90 Coupe Quattro
In message <199803121742.LAA03818@o2.eai.com> firstname.lastname@example.org writes:
> I'm also worried about the mileage. How many miles do the
> 20 valve engines usually last (I know, not an exact question,
> but I don't expect an exact answer :)
The real answer is that nobody knows - not enough have broken yet to give us a
good idea. The bottom end of the post-1982 5-cylinder engines is just about
bomb-proof. I know of only one example (1982) among hundreds of cars where a
re-shelling and crank grinding would now be beneficial. I know of no later
cars with bottom end problems.
The top end is slightly different since the hydraulic lifters, valve stem oil
seals, and sometimes even the valve guides _do_ wear out. Most cars need the
lifters swapping out somewhere between 110000 and 150000 miles. The valve stem
oil seals perhaps a little earlier - good idea to do both at once. Both are
relatively trivial head-on jobs. Valve guide wear, as a _problem_, is rare
(IMO) below 200000 miles.
It's an interference engine. Don't even _accept_ the vehicle and drive it down
the road if the timing belt hasn't been changed. Aged/worn timing belts have a
nasty habit of breaking if they've been sitting on a lot for even a few weeks.
If the engine has been modified in _ANY_ way - seek EXPERT advice.
UK Audi [ur-]quattro Owners Club