You need to keep it up to mark and periodically clean its filters. The other fluids to look into are the radiator coolant, the power steering fluid, brake fluid, windscreen washer fluid, gearbox oil, clutch fluid and differential fluid. The way to check them and keep them at proper levels is given in the car manual.
Important of maintenanceofcar
Regular car service ensures fuel efficiency
A car that goes for regular car service and car maintenance gives huge dividends in fuel efficiency too. Regular changing of oil, coolants, radiator fluid, and other vital fluids vastly improve fuel efficiency, thus giving you better mileage and more bang for your fuel buck!