VW modified an M5 with a ten-cylinder engine before BMW rolled ... Volkswagen built at least three W-10 engines, one of which found its way into a third-generation M5 (E39). But why?

In 2023, we published a story about what many believed to be the last remaining W10 engine built by Volkswagen ... and one is stuffed in an E39-generation BMW M5-based test mule.