87 octane is recommended
Try 87 octane Regular gasoline is OK. gasoline + 10% ethanol, and gasoline + 3% methanol are also possible (if you have a 302cid 5.0 SEFI Windsor engine) the crown Victoria 1990 works better between 90 - 92 octane. best performance gained from 92 octane , smoother acceleration.
89 octane Factory specs.
87 octane.
the best fuel would be 91 octane or premieum.
" regular " unleaded - 87 octane
The 2001 and newer Ford Crown Victoria uses ( 5W-20 engine oil )
If it is leaking, then best to replace it.
The best is to buy a new one.
Your choice of brand. 5w30 for the cold, and 10w30 for warmer areas.
Exactly what the owner's manual recommends. 87 octane. Using a higher octane will provide no benefit whatsoever. No more power, and no better mileage.
I only use BP ultimate, or if im away from that i look for 91 or 93 octane.
NOS octane booster