* Oil Type: The owner's manual is the definitive source, but generally, a 5W-30 conventional or synthetic blend motor oil is recommended. Synthetic oil offers better performance and longevity but is more expensive. Check your owner's manual for the specific weight and type recommendation from Ford. They may specify a certain oil viscosity grade for different climates or operating conditions.
* Oil Filter: Several brands make filters that fit your 4.0L Explorer. Popular and reliable choices include Motorcraft (Ford's own brand), Fram, Purolator, and Wix. Always ensure the filter you select is specifically designed for a 2002 Ford Explorer 4.0L engine. The filter's packaging should clearly state this compatibility. You can look up the correct filter part number using your vehicle's VIN at a parts store website or your Ford dealership.
Crucially: Consult your owner's manual. This is the most reliable source for the exact oil type and filter recommendations from the manufacturer. The manual will also specify the correct oil capacity for your engine. Using the wrong oil or filter can damage your engine.
Don't rely solely on internet advice for this; the information in your owner's manual takes precedence.
