High Quality Content by WIKIPEDIA articles! List of discontinued Volkswagen Group diesel engines. The compression-ignition diesel engines listed below were formerly installed in various marques of automobiles and commercial vehicles, along with marine engine - Volkswagen Marine and Volkswagen Industrial Motor applications, of the German automotive industry conglomerate and business Konzern - Volkswagen Group (VWAG), but are now discontinued. All listed engines operate on the four- stroke cycle, and unless stated otherwise, use a wet sump lubrication system, and are water cooled. Since the Volkswagen Group is European, official internal combustion engine performance ratings are published using the International System of Units (commonly abbreviated "SI"), a modern form of the metric system of figures. Motor vehicle engines will have been tested by a Deutsches Institut für Normung (DIN) accredited testing facility, to either the original 80/1269/EEC, or the later 1999/99/EC standards.