According to the 2008 Lincoln Navigator Owner Guide :
The 5.4 liter 3V , V8 engine takes ( 5W-20 )
* with engine oil filter change ( 7.0 U.S. quarts / 6.6 liters of 5W-20 )
According to the 2008 Lincoln Navigator Owner Guide : With engine oil filter change : ( 7.0 quarts of engine oil )
According to the 2002 Lincoln Navigator Owner Guide : ( 5W-20 engine oil is recommended )
According to the 2006 Lincoln Navigator owners manual ( 5W-20 )
According to the 2008 Lincoln Navigator Owner Guide : With engine oil filter change : ( 7.0 U.S. quarts / 6.6 litres of 5W-20 engine oil )
5W-30 ( according to the 1998 Lincoln Navigator Owner Guide )
According to the 2000 Lincoln Navigator Owner Guide ( 5W-30 )
According to the 2000 Lincoln Navigator Owner Guide ( 5W-30 ) * with engine oil filter change , 5.7 litres / 6.0 U.S. quarts of 5W-30 engine oil
According to the 2005 Lincoln Navigator Owner Guide : With engine oil filter change : ( 7.0 U.S. quarts / 6.6 liters of 5W-20 )
According to the 2005 Lincoln Navigator Owner Guide ( 5W-20 ) * with engine oil filter change , 7.0 U.S. quarts / 6.6 litres of 5W-20 engine oil
According to the 2006 Lincoln Navigator Owner Guide ( 5W-20 )
According to the 1999 Lincoln Navigator Owner Guide ( 5W-30 )
owners manual says to use 5w 30 motor oil