Looking at the owners manuals , it looks like the 2000 model year , Ford started using 5 w 20 instead of 5 w 30 in the F-150 engines
Exactly the weight Ford recommends. Brand is your choice as all major brands are good.
take it to a ford dealer.
According to the 2006 Ford F-150 owners manual ( 5W-20 engine oil ) ( 7.0 quarts / 6.6 liters of 5W-20 engine oil is used in the 5.4 liter V8 engine with engine oil filter change on a 2006 Ford F-150 )
According to the 2006 Ford F-150 Owner Guide ( 5W-20 ) for all the available engines
( 7 quarts ) WITH FILTER CHANGE for the 5.4 L - V8 engine according to the 2007 Ford F-150 owners manual
You need to change your oil for your Ford F-150 every 3000-5000 miles. Every 3 months is another good rule to go by.
The 2002 Ford F-150 Owner Guide shows ( 5W-20 ) engine oil
( 6 quarts ) with engine oil filter change
You do not control the oil. You just make sure the oil level is full and changed regularly. Change the oil/filter every 5,000 miles and use the correct weight that is recommended by the manufacture of your vehicle.
With engine oil filter change ( 6 quarts / 5.7 liters of engine oil ) for all the factory available engines in a 1998 Ford F-150
According to the 2011 Ford F-150 Owner Guide : For the 5.0 liter V8 engine : With engine oil filter change ( 7.7 quarts )
6 quarts ( 5.7 liters ) with engine oil filter change - for the V6 and V8 engines in the 1997 Ford F-150