Repco Semi Synthetic 10W-40 Engine Oil 1L Repco's Semi Synthetic 10W-40 Engine oil is specifically designed for superior engine performance and fuel efficiency, while meeting the demands of modern engine technology. Repco engine, transmission and gear oils are made in Australia from high quality oils and additives. Designed fore-most to protect and prolong your engine, transmission and differential components and reduce wear. You can rely on Repco oils to protect while withstanding all of the demands you put on your vehicle day after day. If you're unsure which oil designed for your vehicle, try the Rego Search function and add the vehicle to your garage.