The best oil for your is 250 f depends on what you are hoping to achieve. There is a synthetic oil made by BMW that claims to make the bike run 10 degrees cooler.
with your hands
How much motor oil is needed to fill an 1992 f-250? How much motor oil is needed to fill an 1992 f-250?
any that meets the CJ-4 raiting
No, you do not have to prime the oil pump.
The 2004 Ford F-250 owners manual shows : 6.0 quarts ( 5.7 liters ) with oil filter change
1988 F-250 351 Windsor oil pump is located in the oil pan . You will have to unbolt the motor mounts and jack the engine up slightly to remove the oil pan to gain access .
According to the 2011 Ford F-250 diesel supplement : With engine oil filter change : ( 13.0 U.S. quarts )
Oil pan
7 quarts ( 6.6 liters ) WITH ENGINE OIL FILTER CHANGE , according to the 2006 Ford F-250 owners manual
The 2010 Ford F-250 owner Guide shows : 7 quarts ( 6.6 liters ) with engine oil filter change
15 quart
depents of the engine type.