Auto, or 5 speed ?
Recommended....5W30.
10W30 in the engine.
Just the one?
Right side front of the oil pan.
Fill up the transaxle using the large plug on the front side of the case. When the gear oil begins to overflow it is full.
Front of engine, below oil filter
the rear passnger side corner of the oil pan
According to my Chilton's Auto Repair Manual : For the 1991 Ford Tempo , 2.3 litre four cylinder engine : ( 5.0 US. quarts with engine oil filter change )
According to my Chilton's Auto Repair Manual : The 2.3 litre four cylinder engine in a 1989 Ford Tempo takes ( 5.0 US. quarts with engine oil filter change )
Just below the oil filter toward the front of the car.
According to the 1996 Ford Probe Owner Guide : For the manual transaxle ( transmission ) ( Ford SAE 75W/90 gear oil , meeting Ford specification API GL-4 )
2.3 L engine. You have to drop the oil pan to get at the pump. You can do this with the engine in the car.