If you look under the front of the car, directly in the middle the is a plastic cover that says "oil filter," remove that cover ( it should only be held on with two to four screws/bolts) the oil filter is in there. Once finding it, turn it counter clock wise to remove it. Remember to drain the oil from the oil pan before changing the filter.
According to the 2007 Ford Fusion Owner Guide : With engine oil filter change , the 3.0 liter V6 engine takes ( 6.0 quarts / 5.7 liters )
According to the 2010 Ford Fusion Hybrid Owner Guide : With engine oil filter change : ( 5.0 U.S. quarts / 4.7 liters of 5W-20 )
It requires 6.0 quarts of SAE 5W20 oil with filter change.
Motorcraft Oil Filter: FL-820S
According to the 2007 Ford Fusion Owner Guide : For the 2.3 liter four cylinder engine : ( 4.5 quarts with engine oil filter change )
According to the ( 2007 ) Ford Fusion Owner Guide : For the 3.0 litre V6 engine : With engine oil filter change : ( 6.0 U.S. quarts of 5W-20 engine oil )
The Ford Fusion V6 takes 6.0 quarts of 5/20 engine oil, including the filter.
According to the 2009 Ford Fusion Owner Guide : With engine oil filter change : The 3.0 liter DOHC , Duratec engine takes ( 6.0 U.S. quarts )
4.5 quarts , with engine oil filter change ( according to the Owner Guide )
According to the 2012 Ford Fusion Owner Guide : For the 2.5 liter four cylinder engine : ( Motorcraft FL-910S engine oil filter )
According to the 2007 Ford Fusion Owner Guide : With engine oil filter change : The 2.3 liter four cylinder engine takes ( 4.5 U.S. quarts of 5W-20 )
When you change the oil and oil filter.