For a 2000 Mercury Mountaineer :
According to the Owner Guide and fordparts.com :
For the 4.0 liter SOHC V6 engine ( Motorcraft FL-1A )
For the 5.0 liter V8 engine ( Motorcraft FL-820-S )
Also fits the 4.6L in a 2005 Mercury Mountaineer
( Motorcraft FL-820-S engine oil filter ) for the 4.0 liter V6 and the 4.6 liter V8 engines according to the 2010 Mercury Mountaineer Owner Guide and fordparts.com
According to the 2000 Mercury Grand Marquis Owner Guide : The 4.6 liter V8 engine takes the ( Motorcraft FL-820-S ) engine oil filter Also , with engine oil filter change : ( 4.7 liters / 5.0 U.S. quarts of 5W-30 )
ph16
This oil filter fits many Ford, Lincoln and Mercury car and truck applications.
3.4liter engine takes ph3387a FRAM
Fits many Ford vehicles, some Chrysler, Dodge, Jeep, Lincoln, Mazda and Mercury.
the WIX Oil filter #51360 fits the MF1533 oild filter.
the ( NAPA 3264 ) cartridge fits in fuel filter bowl tha fits the K3B engine...
Walmart has a book that tells you which filter fits your Ford.
The PH8 or PH8A Fram Oil Filter will interchange with applications using the Motorcraft FL1 or FL1A filter. Fits most Ford/Mercury and Dodge/Chrysler/Plymouth pushrod engines plus many more. Too many to list here.
pf 52 oil filter fits what