1999 Crown Vic- adding this oil catch has been a decent idea didn’t realize the considerable amount of oil residue that is already in the can that would have made its way into the intake, clean combustion oil and air should not enter the same chamber anybody who has these 4.6 panther modular engines from 99-02 would know the infamous spark knock due to carbon buildup, as these cars didn’t receive a knock sensor in civilian models until 2003