Vito / Viano
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Which Mercedes Benz Vito / Viano engine is the most reliable? See common problems, reviews and reliability verdicts across generations and engines.
Frequently asked questions
Which Mercedes Benz Vito / Viano engine is the most reliable?
3.0 CDI V6 (OM642) — Maint. Sensitive verdict. The 3.0 V6 CDI (OM642) makes the Vito/Viano effortless — the same robust six used across the Mercedes range and the Jeep Grand Cherokee, ideal for the bigger people-mover Viano. Budget for the OM642's signature niggles: the oil-cooler seals (under the intake) leak, and the intake swirl-flap actuator fails. Plus EGR/DPF and high-mileage injection. With those addressed and good history it's a smooth, dependable long-hauler.
Which Mercedes Benz Vito / Viano engines should you avoid?
None of the Mercedes Benz Vito / Viano engines listed are rated "Problematic" or "Avoid" — but always check the service history before buying.
What are the most common Mercedes Benz Vito / Viano problems?
The most commonly reported problems across all Mercedes Benz Vito / Viano generations and engines: Oil-cooler seal leak, Intake swirl-flap / EGR / DPF, Injector failure (OM651 early Delphi), Timing chain wear, DPF / EGR (stop-start).