Volvo B10M under bus Cold start and air up. 

That's one of the reasons why i jumped at this one rather then another bus I was looking at, Because the B10M although nearing 34 years old and 1.7 million kilometres. It's Chassis and running gear are remarkably clean, Apart from a tiny bit of surface rust on the bare metal exhaust and turbo housing there's absolutely no rust. If you also pay close attention at the 4:26 mark you'll hear like a little puff of air, Then pay attention to the gear box area and you'll see how much it raises when aired up it's probably a good 5 - 10cm.