If the cylinder head has not been replaced with a properly done rebuilt, and
you can't afford to replace it yourself, don't buy the car.
I believe that some people make it to 200,000 miles without these problems,
but I know of many who have had them before 100,000. This is turbo gas N9T I
am talking about here, not any other Puegeot. Mileage is practically
irrelevant on any other 505--what counts is the condition of the car; I have
a couple of 200,000 mile 84 STIs, one gas, one turbodiesel, that I bet will
go the next hundred thou at less cost than that N9T (unless the head and
turbo have already been replaced--then it might be close.
Beware the used N9T unless the extra performance really means a lot to you,
and you are willing to pay for it in maintenance. The first 100,000 may be
cheap, if you are lucky and good to the car; the second and third won't be.
Brian Holm