A 1993 Mercury Capri (with the 1.6 4 cylinder DOHC engine) requires 3.2 quarts of oil.
You don't mention the model year of Mercury Mountaineer , or the engine size , but the 4.0 liter Single Over Head Cam , V6 engine has always taken ( 4.7 liters / 5.0 U.S. quarts of 5W-30 with engine oil filter change )
According to the 1998 Mercury Mystique owners manual : For the 2.5 liter V6 engine : With engine oil filter change : ( 5.8 U.S. quarts / 5.5 litres )
According to the 2006 Mercury Grand Marquis Owner Guide : With engine oil filter change : ( 6.0 U.S. quarts of 5W-20 engine oil )
7 quarts
As much as the engine manufacturer specifies.
as much as it takes to fill it up dummy
According to the 2000 Mercury Villager Owner Guide : For the 3.3 litre V6 engine : With engine oil filter change : ( 4.0 litres / 4.2 US. quarts of 5W-30 engine oil )
With engine oil filter change ( 5 quarts / 4.7 liters of engine oil )
( 5 quarts / 4.7 liters of engine oil ) with engine oil filter change
These engines take about 4 quarts of oil.
It should hold 10 quarts