Four-stroke engines – most commonly seen in cars, lawnmowers and generators – require oil to keep their moving parts from seizing up and overheating. As well as keeping parts lubricated, four-stroke oil also forms a light coating that protects them from the effects of moisture and rusting over time. Four-stroke oil is sold in a wide variety of viscosities, such as 10w40 (the “W” stands for “winter”). This basically tells you how thick or thin the oil is, and the temperatures at which it performs best. You don’t need to understand oil viscosity to keep your engine running – just look at the type of oil the manufacturer recommends in the vehicle’s handbook. Euro Car Parts stocks a huge range of oils designed for a wide variety of engines, so whatever kind of four-stroke oil you need, we’ll be happy to help you find it at a great price.