What should I know before buying a used BMW M1?

I'm thinking about purchasing a used BMW M1, but I'm not sure what to look for. Can you give me some advice on what to check before making a decision?

First and foremost, make sure to thoroughly inspect the car for any signs of damage or wear. Check the body for dents, scratches, and rust, and take note of any repairs or replacements that have been done. It's also important to take the car for a test drive and pay attention to any strange noises or vibrations.

Another important aspect to consider is the car's maintenance history. Ask the seller for service records and check if the car has been regularly serviced and maintained according to BMW's recommendations. This can give you a good idea of the car's overall condition and potential future expenses.