You don't..
The computer controls it.
http://www.guzzle7pt3.com/rdiff.php
Overheating, oil in the water of radiator, water in the oil. Less power.
Failsafe engine mode
no
Not 100% sure on an 05 but on the 01 it is in the engine bay right in the centre of the firewall.
Click on the link below Click on Owner Guides The Ford F-250 , 6.0 liter diesel supplement will have a chart of oil grades / temperature range
According to the 2005 Ford F-150 Owner Guide : The 4.6 liter V8 engine takes ( 6 quarts / 5.7 liters of engine oil ) with engine oil filter change
yes you can
to reset "check engine light"- (on '05 freestyle) remove the negative cable from the battery for at least 20 min. It worked for me
Fram PH2 Oil Filter, will fit 1991-2002 Ford, 2000-2001 Mazda, Winnebago, 05-92 Ford, 04-96 Ford Gasoline, 05-93 Ford Truck, 05-91 Lincoln, 05-98 Lincoln Truck, 05-03 Mazda, 05-00 Mazda Truck, 05-92 Mercury, & 05-97 Mercury Truck, Winnebago.
According to the 2005 Ford Expedition owners manual : The 5.4 liter 3V , V8 engine takes : With engine oil filter change : ( 7.0 quarts / 6.6 liters of engine oil )
With engine oil filter change : 5 quarts ( 4.7 liters ) of 5W-30 for the 4.0 L - V6 engine and 6 quarts ( 5.7 liters ) of 5W-20 for the 4.6 L - V8 engine ( according to the 2005 Ford Explorer Owner Guide