om612 Turbo(2002-2003 US Sprinters)

Original Equipment Garrett Turbocharger.
Don't buy rebuilt, there is dubious quality control.
Don't buy aftermarket, you could be asking for lots of trouble.
Does your tubo smoke? Do the blades look chewed up? Does the input shaft wiggle from side to side? 
If you answered "yes" to any of these, you should consider replacing your turbo.
If you think you can save some money by buying rebuilt or aftermarket turbos, remember that a bad turbo can RUIN YOUR ENGINE.