Very carefully.
The 2004 Lincoln Navigator has a V8 engine.
According to the 2004 Lincoln Navigator Owner Guide : With engine oil filter change ( 7.0 quarts )
According to the 2004 Lincoln LS Owner Guide , the 3.0 liter V6 engine takes : ( 6.9 quarts ) with engine oil filter change
5 Qts, ========================================================= According to the 2004 Lincoln Navigator Owner Guide : With engine oil filter change : ( 7.0 U.S. quarts of 5W-20 )
The 2004 Lincoln Navigator has a 5.4 L base engine size.
According to the 2004 Lincoln LS Owner Guide : For the 3.0 litre V6 engine : With engine oil filter change : ( 6.5 litres / 6.9 U.S. quarts of 5W-20 engine oil )
The 2004 Lincoln Navigator's engine produces 300 hp @ 5000 rpm.
The 2004 Lincoln Navigator's engine produces 355 ft-lbs. @ 2750 rpm.
According to the 2004 Lincoln LS Owner Guide : With engine oil filter change : The 3.0 liter V6 engine takes ( 6.9 U.S. quarts ) The 3.9 liter V8 engine takes ( 6.5 U.S. quarts )
According to the 2004 Lincoln LS Owner Guide : With engine oil filter change : The 3.0 liter V6 engine takes ( 6.9 U.S. quarts ) The 3.9 liter V8 engine takes ( 6.5 U.S. quarts )
I was looking at the ( 2004 ) Lincoln LS Owner Guide and it shows : For the 3.9 liter V8 : With engine oil filter change ( 6.5 quarts of engine oil )
According to the 2004 Lincoln LS Owner Guide : With engine oil filter change : The 3.0 liter V6 engine takes ( 6.9 U.S. quarts of 5W-20 ) The 3.9 , V8 takes ( 6.5 quarts / 5W-20 )