Vital to your vehicles engine, 5w-20 engine oil is what ensures your vehicles internal components are lubricated correctly to prevent them from seizing. Engine Oil Viscosity refers to the oils resistance to flow. It is therefore important to ensure 5w-20 oil is the correct oil for your requirement. Using the wrong engine oil could cause engine wear as well as affect the engines performance as a whole. We stock a variety of 5w-20 in various different sizes from top up 5w-20 1 Litre Bottles to full oil change 5 Litre 5w-20 Bottles. At Aceparts.co.uk we stock a wide range of quality 5w-20 Engine Oils for all types of vehicles, so we're 99.9% sure we will have the engine oil you require. Be sure to order online with Aceparts for a hassle free, money saving experience.