GT SYNTH LD 10W-40 is a synthetic long drain interval smooth-running engine oil for all-year use in petrol and diesel car engines (normally- or turbo aspirated) and direct injection systems. Its excellent cold starting properties, lowered fuel consumption, friction and wear make this a reliable and excellent heavy-duty oil for your vehicle. It was specifically developed for low evaporation loss with a low viscosity in the SAE 10W-class.