The recommended engine oil for a Ford Focus Zetec depends on several factors, including the specific year and engine size of your car.
You absolutely must consult your owner's manual. It will specify the correct oil viscosity (like 5W-30 or 10W-40) and the required oil specification (like Ford WSS-M2C913-A or WSS-M2C913-C or others). Using the incorrect oil can damage your engine.
Don't rely on general advice found online; your owner's manual is the definitive source for this information.
