What it is
This is a Garrett turbocharger (part number 7773185003W) for the Mercedes-Benz OM642 3.0L diesel engine, used in Sprinter and CDI Bluetech models. It is a billet-compressor-wheel-only upgrade: internally it matches stock turbo behavior and response, but replaces the factory cast compressor wheel with a fully billet one.
What problem it solves
The factory cast compressor wheel on the OM642 has a documented failure pattern at high altitude — specifically at 4,500 feet elevation and above. The billet wheel in this turbo does not share that failure mode and is recommended as a preventive upgrade for vehicles that operate at altitude, not just as a repair for a failed unit.
Key specs
Fitment
2007–2020 Mercedes-Benz Sprinter and CDI Bluetech, 3.0L OM642 engine. Does not fit W166 or X166 chassis models.
Critical install requirement — read before purchase
This turbocharger must be installed with the Mercedes-Benz Turbocharger Support Block (sold separately), which carries the oil feed and return passages for the turbo. If the Support Block is not purchased and installed alongside this turbo, the warranty is void with no exceptions. This is a manufacturer-level requirement, not a KermaTDI upsell — Mercedes recommends replacing the support bracket at every turbo swap to prevent oil contamination or oil starvation.
Common questions
Does this turbo fit W166 or X166 Sprinter models? No, this part is excluded from those chassis codes.
Will this turbo add more power than stock? No — it's a billet-wheel-only upgrade designed to match stock performance with better response and altitude durability, not a power upgrade.
Do I need to buy the Support Block separately? Yes, and it's not optional if you want warranty coverage. Installing this turbo without the Support Block voids the warranty entirely.
What altitude makes the billet wheel worth it over the stock cast wheel? KermaTDI specifies 4,500 feet and above as the threshold where the factory cast wheel has a known failure history.
