ZX1 Extralube is a micro oil metal treatment which can be used in engines or gearboxes (manual and automatic*) which is designed to protect and prolong the life of metal surfaces, smoothing and lubricating, reducing friction, therefore saving energy and fuel and reducing harmful emissions.ZX1 Extralube does not change the properties of the oil but chemically bonds to the metal surfaces, modifying the friction surfaces of the metal. It allows the oil to do its job even better and the significant benefits result in: Lower Emissions Increased MPG Excellent cold start protection and anti-wear performance# Protects immediately up to 25,000 miles Impregnates all wearing surfaces Virtually eliminates frictionZX1 Extralube is available in 3 sizes 100 ml - Treats up to 500cc engine 250 ml - Treats up to 3500cc engine 1 litre - For treating multiple engines* When no metal to metal friction plates are present; most modern automatics have composite fibre to metal plates.