[ficke]

One of the fun off shoots of going and looking at a car to buy or even selling a car is maybe meeting a fellow enthusiast, making a new friend.
One way to burn that bridge is with bad manners.
Besides the ones talked about here in transaction fair play. There is looking at sellers other cars, maybe even their collection.
So these are my suggestions.
1) Do not talk about other cars, enjoy the ones being shown to you.
The last thing some one wants to hear when they are showing their pride and joy is for their audience to be talking about other cars. You do not talk to the person you are having sex with about other women you like, same thing.
2) Do not talk money, how much he paid? how much they are worth now? etc.
3) Do not point out flaws in the cars being shown, paint chips, oil leaks, incorrect parts, etc.
Things to do
1) Ask question about the car you are looking at, history?, what he enjoys about it? etc.
2) Answers question asked about your cars by your host.
3) Volunteer information that would make you a better audience, "I use to work on these", "I used to race these", "This was my dream car as a kid", etc.

When showing your cars
1) Do not say this is the best or bad mouth other cars, your viewers might have driven up in one of those.
2) Do not talk money. Are you showing your investment portfolio or are you sharing your car hobby?

I am sure there are many more good rules to follow, these are just some of mine.

Enjoy!