I'm planning on checking out this 89.5 carrera 4 coupe:
http://www.rutlandmotorcars.net/1989_Porsche_911_142735480.veh
The dealer said the following in an email, I'm worried the small oil leak could be a sign of future issues:
"The magnetic bra is removable. *There are no real cosmetic issues with the car. *It is in very good condition. *There is no rust on the car and the underside looks very good as well. *There is a small engine oil leak. *Over the last 45 days the car has dripped a spot the size of a silver dollar. *I don't consider that to be a real issue in a car that is 23 years old."