The 2004 Ford Mondeo Zetec petrol engine likely requires
5W-30 engine oil. However, to be absolutely certain, you should
check your owner's manual. The specific oil grade and quantity will be listed there. The manual will also specify whether it needs to be a specific type of oil (e.g., synthetic, semi-synthetic, or mineral).
Ignoring the owner's manual could lead to engine damage. The manual is the definitive source of information for your car's maintenance needs.
