Maintenance Engine Oils Motorex Motor Oil 4t 10w40 4l Golden. This product is a 4-liter container of motor oil designed for use in 4-stroke engines.The oil has a viscosity rating of 10W40, which means it is suitable for use in a wide range of temperatures and provides excellent protection against wear and tear.This motor oil is ideal for use in regular maintenance of your vehicle ́s engine, helping to keep it running smoothly and efficiently.