I used to maintain several of them. Seemed like if you owned a Peugeot, and were a DIY guy, everyone with a Pug would find you, and you became their mechanic.

The only recurring problem I know of regarding the Peugeot diesels, is that annual retorqing of the cylinder head bolts should be considered as PM. Many of the Peugeot diesels ( and gassers, for that matter) used steel wet liners in cast iron blocks, and aluminum heads. Many different coefficients of expansion. Left unattended they head bolts will lose their grip, allowing the head gasket to leak. I never had one warp, though.
Loosen each bolt in sequence, check that the threads are clean, lube and reinstall. Peugeot had several different torquing methds, make sure you follow the one for your engine.
Whole job takes an hour, or less, and then you can drive for another year without worry.

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags