Whether 10W-40 oil is okay for your 2000 Ford Ranger depends entirely on what the owner's manual recommends.
Always consult your owner's manual. The recommended viscosity (like 10W-40, 5W-30, etc.) is crucial for proper engine lubrication and performance. Using the wrong viscosity can damage your engine.
While 10W-40 is a common oil weight, it might be too thick or too thin for your Ranger's engine. Using a heavier oil than recommended can increase engine wear, while using a lighter oil might not provide sufficient protection.
