There is specific guidelines most classic car buyers use when shopping for their dream classic and used Porsche for sale. It’s an unspoken process that has been developed by car clubs and collectors of classic and used Porsche for sale that has generally been kept within that exclusive circle. In fact, if you happen to find yourself among these car enthusiasts, they have their own mannerisms in communicating and relating to each other that can make you feel like an outsider. Unless you are a member of a Porsche car club then it would be hard to explain in words exactly how this happens but suffice it to say, it is similar to being a member of a fraternity or exclusive country club.
At any rate, the guidelines is somewhere along these lines, and it should help you arrive at the right decision for your Porsche purchase.

Rule Number One: Be choosy with whom you transact with. Select someone who has been doing it as a business and with the proper permits. The only exception to this rule would be buying from a personal friend or relative.
Rule Number Two: Never be emotional about your purchase. A classic used Porsche may be your dream car but it will need to be in excellent condition; not just be a Porsche that looks good. Hands down, it should look perfect upon first glance but it should also be 100% maintained as well.
Rule Number 3: Back away if the seller is tentative about supplying information about the car. Also, if it is a second-hand Porsche, it will have flaws. If it does not have even the slightest damage, then you should investigate further. Follow your instincts and while you don’t have to back away from the sale, you should proceed with caution and do more research.
Rule Number 4: Talk to the seller or dealer. You are an expert or at least you have accumulated quite a bit of knowledge on the Porsche you want to buy, so ask away. Try to find out how well-versed the dealer is about the Porsche – not just the car in question but the Porsche story.
Rule Number 5: a classic Porsche is like a member of the family. The seller or dealer must be intimate with details about the car. If he refuses to give you information about the car, its history, past owners, problems, parts replaced, etc. then you should move on and look for someone else. You aren’t buy just any car – you’re buying a Porsche!