The 1991 Ford Ranger typically uses 5W-30 motor oil for most driving conditions. However, if the vehicle is operated in extremely high temperatures, 10W-30 can also be used. Always check the owner's manual for specific recommendations based on your engine type and local climate conditions.
In the oil pan
That would depend on what year of Ford Ranger and what size of engine it has
( 5W-30 ) is the preferred oil , according to the 1997 Ford Ranger Owner Guide
my 2009 ford ranger 2.3 owners guide say use 5w-20
10/30 --------------------------------------------------------------------------------- According to the 1996 Ford Ranger owners manual ( 5 W 30 is the PREFERRED oil )
5 W 30
That would depend on the model year and engine size of the Ford Ranger A little more information please
If your looking for the oil level sensor it would be located on the driver side on the oil pan.
Bad oil pressure sending unit?
it is in the side of the oil pan
80-90w in the tranny and the rear differential.
According to the 2000 Ford Ranger owners manual: ( 5W - 30 ) for your 2.5 L four cylinder engine