Your choice of brand. 5w30 for the cold, and 10w30 for warmer areas.
If it is leaking, then best to replace it.
The 2001 and newer Ford Crown Victoria uses ( 5W-20 engine oil )
The best is to buy a new one.
87 octane is recommended
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Cadillac Deville Ford Crown Victoria Mercury Grand Marquise Lincoln TownCar
32 all around is good. You can go 34 in the rear if you want.
1999 Ford Crown Victoria side marker light bulb replacement: Purchase the correct replacement side marker light bulb(s) first, before disassembling the vehicle. See sources and related links below for replacement bulb information. Then consult your owner's manual for the side marker light bulb replacement procedure. As simple as it sounds, the owner's manual is the best place to start for bulb replacement instructions and illustrations.
put 35 pounds in all tires solve the best problems
This work involves a torch and best with air tools. If you are not equipped, then it would be best to take it to a garage. I know, $$$$$$$$
Best Buy can order one for you, or you can go on ebay.com