Bottom front of engine.
If you mean the oil pressure sender it's right next to the oil filter.
According to the 1998 Mercury Villager Owner Guide ( 5W-30 ) is the preferred oil
10w30
4.3 with filter.
without oil filter 3.7 quarts with oil filter 4.2 quarts
On the oil pan. -> -> -> On the bottom.
PH 7317.
2000 mercury villager
right above the oil filter on the transmission side of the filter mount
Right next to and above the oil filter.
without oil filter 3.7 quarts with oil filter 4.2 quarts
According to the 1997 Mercury Villager Owner Guide ( and one of the Ford websites ) The 3.0 liter V6 engine takes the ( Motorcraft FL-839 ) engine oil filter