I was in a 430,000 mile 1999 Crown Vic P71 taxi a few days ago. It was a local sheriffs cruiser before it was bought to be a taxi and all on the original engine and a probably rebuilt transmission.
After 17 years of being used as first a police car, then a taxi this thing still felt extremely solid and sound. It sometimes amazes me how well these things hold together.
Pictured: Random Picture from the internet