A 1999 Ford Ranger's recommended oil type depends on the engine it has. You need to check your owner's manual for the specific recommendation. However, generally speaking, many 1999 Ford Rangers used
conventional 5W-30 motor oil. Some may also specify
10W-30.
Crucially, always check your owner's manual. The manual will list the correct oil viscosity (like 5W-30 or 10W-30) and the oil type (conventional, synthetic blend, or full synthetic). Using the wrong oil can damage your engine.
