Having your oil and oil filter changed, at least as often as recommended by the manufacturer, is likely to generate the single biggest return on your routine-maintenance investment. Replacing the dirty oil and filter will help protect the internal parts of the engine from premature wear. It’s important to use the recommended grade of oil for your vehicle for the best protection and fuel mileage. See your vehicle owner’s manual for the recommended oil change interval, or follow the oil-life monitoring system, if equipped. If you are unsure, the industry guideline is 5000km or 3 months or for regular oils. Remember you cannot damage your engine by changing your oil too often.