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There are two head gaskets in the V 8 1999 mercury mountaineer
There are seat belts for ( 5 ) people
( 5 quarts ) with engine oil filter change
Look under the vehicle and count them.
According to the 2004 Mercury Mountaineer Owner Guide : ( 22.5 U.S. gallons )
the four door speakers are 6x8 and the sob if you have one is 8"
( 6 ) if you have the 4.0 liter SOHC , V6 engine and ( 8 ) if you have the 5.0 liter , V8 engine
Two.
According to the 2007 Mercury Mountaineer Owner Guide : ( there are 5 lug nuts per wheel )
According to the 2007 Mercury Mountaineer Owner Guide : ( the fuel tank capacity is 22.5 U.S. gallons )
4
22.5 gallons