You can use your favorite oil whichever it might be. Grade 10w30 or for colder climates in the winter 5w30 will do.
5/w20 ========================================================= For a ( 1993 ) Ford Crown Victoria ( 5W-30 is the PREFERRED oil ) 2001 and newer Ford Crown Victoria Owner Guides show to use 5W-20
A 1993 Ford Crown Victoria came from the factory with ( 5W-30 )
The oil sending unit on 1993 crown victory is located right under the oil filter.
5 qts. with oil filter
For a 1992 Ford Crown Victoria : It came from the factory with the PREFERRED oil ( 5W-30 )
A high mileage oil should be used.
5-30
5W-30 is the preferred oil according to the Owner Guide
According to the 1998 Ford Crown Victoria Owner Guide ( 5W-30 ) ( with engine oil filter change , 4.7 litres / 5.0 U.S. quarts of 5W-30 oil )
A 2000 Ford Crown Victoria with the 4.6L V8 engine requires 5.0 quarts of oil.
5 w 30 ( according to the owners manual )
The 2000 Ford Crown Victoria owners manual shows SAE 5 W - 30 engine oil