As a pioneer of this technology, Volkswagen reacts early to the demand for an environmentally friendly car. In 1984, Volkswagen offers special conversion parts for all of its models, cutting hydrocarbon and nitrogen emissions by half. A newly developed micro catalytic converter makes the conversion of small capacity possible; a catalytic converter is a device used to reduce the toxicity of exhaust emissions from an internal combustion engine. By November 1987, Volkswagen has completed the changeover of its production to catalytic converter technology. Since this time, all Volkswagen passenger cars equipped with petrol engines are available with catalytic converters. The decisive breakthrough would come in 1989 as Volkswagen premiered the first diesel engine with a catalytic converter. The 60 hp engine consumes only 4,6 litres per 100 kilometres. The turbo-charger optimises combustion, reducing soot emissions even at full speed.