Depends on your driving style. I have an 03 with the 4.6L V8 and routinely get 22HWY/18 CITY.
Yes.
According to the 2003 Mercury Mountaineer Owner Guide : ( DOT 3 brake fluid , meeting Ford specification ESA-M6C25-A )
That would be the 4.6 liter engine, which takes six quarts. * of 5W-20 according to the 2003 Mercury Mountaineer Owner Guide
I get 15.3 in my 2005.
4
( # 24 ) is a blue color 15 amp fuse for the cigarette lighter and OBD II in a 2003 Mercury Mountaineer ( under the instrument panel )
On a 2003 Mercury Mountaineer , 4.6 litre V8 engine : firewall 4 - 8 3 - 7 2 - 6 1 - 5 front of vehicle
only when it begins to fail.
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5.0 quarts 4.7L ( of 5W-30 for the 4.0 liter V6 ) 6.0 quarts 5.7L ( of 5W-20 for the 4.6 liter V8 ) In a 2003 Mercury Mountaineer
The fuel pump is inside the gas tank you have to drop the tank to get it out
The computer module in a 2003 Mercury Mountaineer is located behind the rear right panel in the truck space. The rear right seat belt panel must be removed and then the lower panel. The module is located beneath a green plug.