What weight motor oil for a 1998 4.6L?

The recommended weight of motor oil for a 1998 4.6L engine depends on several factors, including your location and the specific recommendations in your owner's manual. However, generally, 5W-20 is a common and often recommended weight for this engine in most climates.

Crucially, you should consult your owner's manual. It will specify the recommended oil viscosity (weight) and type (conventional, synthetic blend, or full synthetic). Ignoring this could damage your engine.

If you don't have the manual, you can often find a digital copy online by searching for your specific vehicle's year, make, and model. The Ford website might also be helpful.