According to the 2001 Ford Ranger Owner Guide :
With engine oil filter change :
( the 3.0 liter " Vulcan " V6 engine takes 4.3 liters / 4.5 U.S. quarts of 5W-20 )
The 2.5 liter ( gas ) four cylinder in a Ford Ranger is : 1998 and 1999 ( 117 horsepower ) 2000 and 2001 ( 119 horsepower )
With engine oil filter change ( 5.0 quarts / 4.7 liters of engine oil ) according to the 2001 Ford Ranger Owner Guide for the 4.0 liter V6 engine
The 2006 Ford Ranger 3.0 liter V6 has ( 148 horsepower )
The Ranger Station . com ( no spaces ) shows the 2000 and 2001 Ford Ranger 3. 0 L as 150 horsepower @ 4750 RPM and 190 ft/lbs torque @ 3650 RPM
2.3 liter DOHC - 4 cylinder ( 135 horsepower ) 3.0 liter OHV - V6 ( 150 horsepower ) 4.0 liter SOHC - V6 ( 207 horsepower )
Ford equipped the 1998 Ranger with 3 engines. 2.0 Liter I4 80 H.P. 2.3 Liter I4 90 H.P. 2.9 Liter V6 140 H.P.
I believe the 2.9 liter V6 engine in a 1988 Ford Ranger is rated at : ( 140 horsepower )
The 2.5 liter 4 cylinder engine in a 1998 Ford Ranger has 117 horsepower at 4500 RPM
For a 2001 Ford Ranger , 3.0 L " Vulcan " V6 engine : I believe that is rated at ( 150 horsepower at 4750 RPM )
145 horsepower for the 3.0 L Vulcan - V6 engine in a 1993 Ford Ranger
The cost is about $3,000 to $5,000. The price can vary by the style. See more at http://www.edmunds.com/ford/ranger/2001/index.html
The 2.9 liter V6 engine in a Ford Ranger ( available from the 1986 to 1992 model years ) is rated at ( 140 horsepower from the factory )