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Bottom of the engine on the oil pan.
The 2010 Milan requires 5W20 Synthetic Blend (Motorcraft preferred or equiv.)
The Oil is drained by removing a plug in the oil pan, and letting it run into a pan. The filter is screwed to the side of the engine. After the oil is drained and the filter changed, add oil and check frequently to prevent overfilling.
Drain plug is located on oil pan located on bottom of engine.
4.5 quarts
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 )
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 )
Place a drip pan below the oil pan and oil filter. Remove the oil pan plug. Drain the oil into the oil pan. Replace the plug to the oil pan. Turn the oil filter to the left, to remove. Fill the oil filter with oil and replace it to its original position. Fill the motor with oil.
4.5 quarts / 4.25 liters , with engine oil filter change ( according to the Owner Guide )
4.5 quarts ( 4.25 liters ) with engine oil filter change , according to the Owner Guide
( 6.0 quarts ) with engine oil filter change , according to the Owner Guide
It may also depend on the climate you live/drive in. Consult the owners manual for that info.