According to the 1999 Ford F-250 Super Duty Owner Guide :
With engine oil filter change :
The 6.8 liter V10 gasoline engine takes ( 6.0 U.S. quarts of 5W-30 )
6 quarts with the filter change.
i have an SE and it takes 6 quarts. ford now recommends 5w-30
5 quarts with engine oil filter change
A 1999 Ford F150 with a V6 engine has a transmission fluid capacity of 14 quarts. If performing a pan drop only five quarts of fluid are needed.
I was looking at the 1999 Ford F-250 , 7.3L DIESEL supplement and it shows : With engine oil filter change : ( 15.0 U.S. quarts )
According to the 1999 Ford Expedition Owner Guide : With engine oil filter change : ( 6.0 U.S. quarts )
5 quarts with engine oil filter change
6 quarts with filter change.
With engine oil filter change ( 5 quarts of engine oil )
For the 3.0 liter V6 engine in a 1999 Ford Ranger , with engine oil filter change : ( 4.5 quarts ) according to the Owner Guide
For a 1999 Ford Expedition , 4.6 liter V8 : With engine oil filter change : ( 6.0 U.S. quarts of 5W-30 ) according to the Owner Guide
The 1999 Ford F-150 owners manual shows ( 6 quarts ) with engine oil filter change