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Should use 10 W 30 oil for a 97 Ford 150 4.2 liters?

The owner's manual for your 1997 Ford F-150 with the 4.2L engine is the definitive source for the correct oil weight. However, 10W-30 is a very common and likely suitable oil weight for that engine and year. Many older vehicles ran just fine on 10W-30.

But, before you use it, check your owner's manual. The manual will specify the recommended oil weight and viscosity grade for your specific engine under various conditions (temperature, etc.). Using the incorrect oil weight can negatively impact engine performance and longevity.