According to the 2006 Mercury Milan Owner Guide :
For the 3.0 litre " Duratec " V6 engine :
With engine oil filter change :
( 6.0 US. quarts / 5.7 litres of 5W-20 )
4.5 quarts / 4.25 liters , with engine oil filter change ( according to the Owner Guide )
4.5 quarts
Drain plug is located on oil pan located on bottom of engine.
4.5 quarts ( 4.25 liters ) with engine oil filter change , according to the Owner Guide
According to the ( 2006 ) Mercury Milan Owner Guide : With engine oil filter change : The 3.0 liter Duratec , V6 engine takes : ( 5.7 liters / 6.0 U.S. quarts of 5W-20 )
According to the 2006 Mercury Grand Marquis Owner Guide : With engine oil filter change : ( 6.0 U.S. quarts / 5.7 litres of 5W-20 engine oil )
Bottom of the engine on the oil pan.
The 2010 Milan requires 5W20 Synthetic Blend (Motorcraft preferred or equiv.)
According to the 2006 Mercury Mountaineer Owner Guide : The 4.0 liter V6 engine takes : With engine oil filter change : ( 5.0 US. quarts / 4.7 litres of 5W-30 engine oil )
4.5 quart
4 litres.
4.2 quarts