According to the 1998 Mercury Grand Marquis Owner Guide :
With engine oil filter change ( Motorcraft FL-820-S )
The 4.6 liter V8 engine takes ( 5.0 U.S. quarts / 4.7 litres of 5W-30 )
( 5 quarts with filter change ) according to the 1999 Mercury Grand Marquis owners manual
It will, though technically it is illegal to istall on older motor into a newer car for emissions reasons.
change wiper motor grand marques
how do you get to and replace the wiper moter on a 97 marquis
driver side of motor in middle
It is a Mercury and Mercury is a division of the Ford Motor Company so...technically it is a Ford.
Take it to a repair shop.
5w-30 is what I use in my 2000 grand marquis, in 2001 ford started saying 5w-20.
it is on the firewall and difficult but not impossible to get to and replace.
According to the 1996 Mercury Grand Marquis Owner Guide : With engine oil filter change : ( 5 quarts / 4.7 liters of engine oil ) * the engine oil dipstick is used to determine the exact fill requirement *
The 2006 Mercury Grand Marquis owners manual shows : The use of synthetic or synthetic blend motor oil is not mandatory - the oil just has to meet Ford specifications
The 1998 Mercury Grand marquis has the 4.6 liter / 281 cubic inch Single Over Head Cam ( SOHC ) engine from the factory