Buying an ex-police car with low miles sounds "cool" because you think those have stupid power but you have to be careful about those. Reason is because they may show low miles but you have to consider how many hours they've been idling. You ever see a cop car idling under a bridge or in a parking lot with the a/c on while he's writing his or her report? Plus you're not even counting the fact that they dog these cars jumping curbs and all that. So unless your going to freshen up the engine in the cop car, find a gently used Caprice or wagon, Buick Roadmaster, Cadillac Fleetwood Brougham as a donor car. Unless of course if your car was a detectives car or a marshalls car where most of it's duty was to serve warrants or go from point a to b.