It’s the zf ecomat gearbox, older buses + gearboxes will have them louder other vids ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-HDiN7gjS8yA.html ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-FHW-fR8EcAc.htmlsi=2canPPQP6BrTSj0P
Ridden this exact bus in person, G5151, Mic dosent do it justice really Pattern i note: any W5060 bus and below the zf is really quiet and all the S buses are really loud. even judging in chronological order the code should mean the W is louder, and the 'older' W buses are really quiet, someone explain?