Are low mileage cars risky?

[paulb]

I'm in the market for a 986 & in the last week I've come across several great looking & driving cars that I am considering making an offer on. I will have a PPI done by a great Porsche mechanic before closing the deal but these are at dealers & have no service receipts. Conventional wisdom is to buy low mileage, but some of the examples I'm looking at only have 35-50k for 15-20 year old cars. Is this problematic? I am concerned about oil acidity & the IMS of course but also general disuse & rot of hoses, boots, belts & such. Is this a big concern? In the past I bought an older underused car that turned out to be a complete mess (though that one had been stored outside).