Up to 1999 is green After 2000 is red
All antifreeze is the same.
A 50/50 mix of water and antifreeze
G12
I use the genuine 'Toyota Long life Coolant' it is red in colour
regular green antifreeze
Red five year, hoat type.
One type of antifreeze that can be used is Pentosin PENTOFROST A1. Pentofrost A1 is an antifreeze for Asian vehicles in water-cooled engines.
it doesen t use regular antifreeze, you have to use dexcool, its orange color
DEX-COOL
dex cool, pink/orange
You can view the 1999 Mercury Grand Marquis owners manual online at : www . motorcraft service . com ( no spaces ) Click on Owner Guides