According to my Chilton's Auto Repair manual :
For a 1989 Mercury Grand Marquis :
With engine oil filter change :
Both the 5.0 / 302 and the 5.8 / 351 take ( 5.0 U.S. quarts )
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 2003 Mercury Grand Marquis Owner Guide : With engine oil filter change ( 6.0 quarts / 5.7 liters of engine oil )
According to the 1997 Mercury Grand Marquis owners manual : With engine oil filter change : ( 5.0 U.S. quarts / 4.7 litres of engine oil )
According to the 2004 Mercury Grand Marquis Owner Guide : The engine cooling system capacity is ( 18 liters / 19 U.S. quarts ) It came from the factory with a 50 / 50 mix of antifreeze and distilled water
According to the 1997 Mercury Grand Marquis Owner Guide : With engine oil filter change : ( 5.0 U.S. quarts / 4.7 litres of 5W-30 engine oil )
The engine in a 1993 grand marquis is a 4.6 litre/281 cubic inch.
how to changing engine coolant on a 1993 mercury grand marquis gs.
According to the 2008 Mercury Grand Marquis Owner Guide : With engine oil filter change : The 4.6 liter V8 engine takes ( 6.0 U.S. quarts / 5.7 liters of 5W-20 )
NO belt in the 302cid engine of a 1988 Mercury Grand Marquis. it is a chain with gears
At the front of the engine , towards the drivers side of the engine ( power steering fluid reservoir on a 1998 Mercury Grand Marquis )
According to the 2000 Mercury Grand Marquis Owner Guide : ( The gas tank capacity is 19.0 U.S. gallons )
As much as the gas tank will hold... ---------------------------------------------------------------------------------------------- On a 1997 Mercury Grand Marquis , the gas tank capacity is ( 20.0 U.S. gallons )