Carlube 5w40 Fully Synthetic Engine oil is a high specification oil suitable for modern petrol and diesel vehicles, designed to help keep engines clean and prolong the engine life. Carlube is the UK s largest independent producer of motor oil, with an extensive range of oils and lubricants. Recommended and approved by TVR and Lotus. Carlube Motor Oil meets the latest API and ACEA requirements. High quality base engine oils are blended with advanced technology additives to give high anti wear and detergency properties in all Carlube mineral, Semi synthetic & fully synthetic motor oils.