It depends on what model year of Lincoln Navigator
According to the various Owner Guides
Up to the 2001 model year ( 5W-30 )
2002 and newer ( 5W-20 )
According to the 2002 Lincoln Navigator Owner Guide : ( 5W-20 engine oil is recommended )
According to the 2006 Lincoln Navigator Owner Guide ( 5W-20 )
According to the 2008 Lincoln Navigator Owner Guide : With engine oil filter change : ( 7.0 quarts of engine oil )
According to the 2006 Lincoln Navigator owners manual ( 5W-20 )
According to the 1999 Lincoln Navigator Owner Guide ( 5W-30 )
With engine oil filter change ( 7.0 quarts ) according to the 2011 Lincoln Navigator Owner Guide
According to the 2004 Lincoln Navigator Owner Guide : With engine oil filter change ( 7.0 quarts )
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
can be oil pressure change the oil filter
5 Qts. of oil
According to the 1998 Lincoln Navigator Owner Guide : With engine oil filter change : ( 6.0 U.S. quarts ) of 5W-30 engine oil
The 2000 Lincoln Navigator oil filter can be found on the right hand side of the engine, near the oil pan. The oil filter can best be viewed from below the engine.