It came from the factory with the Motorcraft BXT-65-650 battery
( That's BCI group size 65 , 650 cold cranking amps )
The 2001 Ford Expedition has a 4-speed automatic.
The 2001 Ford Expedition runs on regular unleaded.
The 2001 Ford Expedition Owner Guide shows ( 5W-20 )
5 w 20 ( according to the owners manual )
Personally I have used Vasaline petroleum jelly on my battery cable connections for many years with no problems
The 2011 Ford Expedition has a 6-speed automatic.
The 2013 Ford Expedition has a 6-speed automatic.
The 2012 Ford Expedition has a 6-speed automatic.
The 2002 Ford Expedition has a 4-speed automatic.
The 2005 Ford Expedition has a 4-speed automatic.
The 2010 Ford Expedition has a 6-speed automatic.
The 2003 Ford Expedition has a 4-speed automatic.