The most common and well known scroll-type supercharger is the G-Lader ("Lader" is German for "charger"), designed by Volkswagen for use in a version of the Mk2 Polo called the GT G40. Launched first as a limited batch of about 500 cars in 1987, most were sold to Volkswagen workers. A normal production version of the G40 was launched as part of the Mk2F range. The name comes from the "G" shape of its compression channels. It was mounted on a petrol engine, which offered performance about that of a naturally aspirated engine.