Does anybody know of any small time dealership that sells police interceptors or diesel engine vehicles? I work all my off duty at construction sites and yes the crown vic runs 6-10 hours per shift. I shall not let my personal car run all hours since it is BAD for naturally aspirated gasoline engines to run for long hours at a time. police interceptors have oil coolers, etc. that help them run longer without much wear and tear. as for diesel engines they run cold and yes it is not great for them