underside of the car in front of the fuel tank.
For a 1999 Mercury Grand Marquis : ( the engine air filter is Motorcraft FA-1668 )
The 1997 Mercury Grand Marquis owners manual shows : ( Motorcraft FL-820S ) and fordparts.com shows : ( Motorcraft FL-820 ) for the engine oil filter
( 6 quarts with engine oil filter change ) according to the 2003 Mercury Grand Marquis Owner Guide
According to the 2006 Mercury Grand Marquis Owner Guide : With engine oil filter change : ( 6.0 U.S. quarts / 5.7 litres of 5W-20 engine oil )
According to the 1999 Mercury Grand Marquis Owner Guide ( and one of Ford's websites ) ( Motorcraft FL-820-S , engine oil filter )
According to the 2002 Mercury Grand Marquis Owner Guide : With engine oil filter change : The 4.6 liter V8 engine takes ( 5.0 U.S. quarts of 5W-20 )
According to the 2003 Mercury Grand Marquis Owner Guide : With engine oil filter change ( 6.0 quarts / 5.7 liters of engine oil )
According to the 2005 Mercury Grand Marquis Owner Guide : With engine oil filter change : ( 6.0 U.S. quarts / 5.7 liters of 5W-20 )
6 quarts -------------------------------------------------------------------------------------------- The 2000 Mercury Grand Marquis Owner Guide shows : With engine oil filter change : ( 4.7 litres / 5.0 U.S. quarts )
According to the 2004 Mercury Grand Marquis Owner Guide : With engine oil filter change : ( 6.0 U.S. quarts of 5W-20 )
According to the 1997 Mercury Grand Marquis owners manual : With engine oil filter change : ( 5.0 quarts / 4.7 liters of engine oil )
According to the 2004 Mercury Grand Marquis Owner Guide : With engine oil filter change : ( 6 quarts )