If he destroyed your car, you can sue him in small claims court if the car was worth less than $7,500 or in county court if the damage was $15,000 or less. If he destroyed it in an accident, you will allege negligence. If they took a sledgehammer to it (hopefully not), then there are other legal theories relating to criminal mischief would be appropriate.
The information provided in this answer does not create an attorney-client relationship and is not considered to be legal advice.
What you should do may depend on the value of your car.
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File suit against your former friend in the appropriate court..
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Mr. Lundeen is licensed to practice law in Florida and Vermont. The response herein is not legal advice and does not create an attorney/client relationship. The response is in the form of legal education and is intended to provide general information about the matter within the question. Oftentimes the question does not include significant and important facts and timelines that, if known, could significantly change the reply and make it unsuitable. Mr. Lundeen strongly advises the questioner to confer with an attorney in your state in order to ensure proper advice is received.
This ans. does not create an attorney/client relationship.