According to the 1999 Lincoln Navigator Owner Guide :
It depends on which engine you have :
The 5.4 liter ( 2 valve per engine cylinder ) uses " regular " unleaded gasoline , 87 octane
The 5.4 liter ( 4 valve per engine cylinder ) takes " premium " unleaded gasoline , 91 octane
* there should be a Premium Fuel Required / Recommended sticker inside the fuel filler door
According to the 2008 Lincoln Navigator Owner Guide : " regular " unleaded , 87 octane
The 2006 Lincoln Navigator is a gas-powered vehicle.
The 2005 Lincoln Navigator is a gas-powered vehicle.
The 2008 Lincoln Navigator is a gas-powered vehicle.
The 2007 Lincoln Navigator is a gas-powered vehicle.
The 2004 Lincoln Navigator is a gas-powered vehicle.
The 2002 Lincoln Navigator is a gas-powered vehicle.
The 2003 Lincoln Navigator is a gas-powered vehicle.
The 2001 Lincoln Navigator is a gas-powered vehicle.
The gas tank on the 2013 Lincoln Navigator holds 28.0 gal..
The gas tank on the 2011 Lincoln Navigator holds 28.0 gal..
The gas tank on the 2006 Lincoln Navigator holds 28.0 gal..