Probably 4-5 qts. Add 4 and check
The 2002 Ford Ranger owners manual shows : WITH FILTER CHANGE 2.3 L - 4 cylinder engine takes 3.8 liters ( 4.0 quarts ) of engine oil
According to the 2002 Ford Ranger Owner Guide : The ( SuperCab ) holds ( 73.8 litres / 19.5 U.S. gallons )
2002 Ford Ranger Edge had no problem with 1500Lbs plus another 1000Lbs on a light trailer
I believe it is 260-265horsepower for the 4.0 L OHV engine in the Ranger and 207 horsepower for the 4.0 L SOHC engine in the Ranger
The 2002 Ford Taurus's engine produces 185 ft-lbs. @ 3950 rpm.
The 2002 Ford Expedition's engine produces 291 ft-lbs. @ 3450 rpm.
The 2002 Ford Explorer's engine produces 254 ft-lbs. @ 3750 rpm.
The 2002 Ford Mustang's engine produces 220 ft-lbs. @ 2750 rpm.
The 2002 Ford Escape's engine produces 135 ft-lbs. @ 4500 rpm.
The 2002 Ford Focus's engine produces 135 ft-lbs. @ 4500 rpm.
With engine oil filter change ( 4.0 quarts / 3.8 liters of engine oil ) for the 2.3 liter four cylinder in a 2007 Ford Ranger
The labor time for a 2000 Ford Ranger with a 4 cylinder engine is 10 hours, or roughly $900. It could be more depending on the year of your vehicle and for the 6 cylinder engine.