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I am getting a combined hwy/city average of 14mpg
I had the same problem with my 99 AWD mountaineer. I was told the front differential was bad.
In a 1997 Mercury Mountaineer : ( 4R70W )
I am pretty sure that it is non existent, i have a 99 mountaineer and it is AWD and i am going to assume that yours has either FWD or AWD which means it has a transmission and a transfer case not a transaxle
5 quarts ( 4.7 liters ) with engine oil filter change
Look under truck at drivers side front between door and tire. If ya see the the front axle driveshaft andya have NO auto/4x4 hi/4x4 lo select switch above cigarette lighter then its AWD. i have a 2000 mercury mountaineer awd. Also the 5 liter v8 was awd.
According to the 1998 Mercury Mountaineer Owner Guide : The 5.0 , V8 is rated at ( 215 horsepower at 4200 RPM and 288 lb.ft. torque at 3300 RPM )
There isn't one. Mountaineers are either 2wd or AWD.
auto trak 2
The owner manual states, unless the diff has been submerged in water, it never needs to be changed.
If your vehicle is All wheel drive you don't unless you drop the front drive shaft, but don't my 1999 is AWD it has saved me numerous times.
It will usually tell you on the transmission's dip stick handle but I also have a98 Mountaineer AWD V-8 and it uses Mercon V