 VW Group engines are commonly known by the type of fuel they use, their displacement, and their rated motive power output.VW Group "does" have names of "engine series", and individual engines are identified by an "ID code" (early codes were one or two letters/numbers, later IDs were generally three letters, and their very latest engines now use four letters) - but they have been known to apply many different ID codes to seemingly identical engines.Volkswagen's inline-four-cylinder diesel engine (D) started out life as the gasoline-fueled EA827 series.