They are pretty much standard across the board now, because they make engines more efficient. I think more new cars have turbochargers or superchargers than don't have them. Generally turbos on petrol engines run hotter because the engines run at higher revs, so these turbos are water-cooled as well as oil cooled. Turbochargers on diesel engines are usually cooled only by engine oil passing through their bearings. So it’s vital that drivers don’t allow that oil supply to be reduced by the coking up of the oil supply pipes, which can happen if a turbocharged engine is simply switched off from red hot rather than idled for a minute or two.