It would probably be worthwhile tackling Peugeot. There was an early
problem with my 505 which required replacing the wet sleeves and
pistons. Apparently it was a fault in the seals. It was outside the
warranty period but they finally met most of the costs. If there is
good reason to think that the fault was caused by an error in design/
manufacture then in most countries the manufacturer is liable for ever
(though the cost of litigation usually makes this not much more than a
technicality). Most countries have government agencies which try to
enforce the legal principle (which is that all goods sold must be of
merchantable quality - which means that they are reasonably suitable
for the purpose for which they are sold). And manufacturers are
increasingly aware of the opportunity offered by channels such as this
newsgroup (or the other one ending in 'sucks') and the press to
publicise bad experiences. The 'warranty period' does not limit the
seller's obligations under the law.
On the other hand, the fact that the failure occurred at 90k, rather
than, say, at 2k, raises a distinct possibility that the failure was
due to something other than bad design/manufacture. But maybe still
worth a try.