5w-20
A 1992 Mercury Grand Marquis came from the factory with ( 5W-30 )
According to the 2006 Mercury Grand Marquis Owner Guide : It came from the factory with a 50 / 50 mix of distilled water and Motorcraft Premium Gold Engine Coolant ( yellow colored meeting Ford specification WSS-M97B51-A1 )
DOT 3
According to the 2003 Mercury Grand Marquis Owner Guide : ( " regular " unleaded gasoline , 87 octane )
What Type and Year of Mercury? (I.E., 1997 Mercury Grand Marquis.)
You can view the 2002 Mercury Grand Marquis owners manual online at : www . motorcraft service . com ( no spaces ) Click on Owner Guides ( page 63 has the list for the type of bulbs used on a 2002 Mercury Grand Marquis )
According to the 1996 Mercury Grand Marquis Owner Guide : ( DOT 3 brake fluid , meeting Ford specification ESA-M6C25-A )
5w-30 is what I use in my 2000 grand marquis, in 2001 ford started saying 5w-20.
You can view the 1999 Mercury Grand Marquis owners manual online at : www . motorcraft service . com ( no spaces ) Click on Owner Guides
According to the 2002 Mercury Grand Marquis Owner Guide ( 5W-20 ) ( with engine oil filter change , 4.7 litres / 5.0 U.S. quarts of 5W-20 engine oil )
On a 1997 Mercury Grand Marquis : Check the Vehicle Emission Control Information ( VECI ) decal in the front of the engine compartment , for the type of spark plug used and the spark plug gap
They run fine on 87 Regular Unleaded