When buying a used 2018 Mercedes-Benz CLS 350d (257), the most frequently mentioned issue is oil leaks and consumption. Clogged Diesel Particulate Filter (DPF) is also commonly reported.
Engine varies by trim; verify the engine code on the listing.
Listed from most frequently reported, each with its source.
The OM642 engine may develop oil leaks from gaskets, the oil cooler, or other seals in the V6 valley area. Unnoticed leaks can contaminate the intercooler and manifolds, and if left unresolved, can lead to incorrect oil level and risk of mechanical damage.
Engine Internal
Frequent DPF clogging is reported on 3.0 V6 (OM642) engines, especially with city or short-distance driving.
Exhaust Emissions
The EGR valve and associated passages are prone to carbon buildup, especially in city driving; this can cause the check engine light, torque irregularities, reduced performance, and error messages.
Exhaust Emissions
Reported turbocharger failures: abnormal whistling noise, power loss, and fault codes due to oil leaks, impeller wear, or actuator/wastegate issues. Typically requires repair or replacement after high mileage or irregular maintenance.
Turbo
Same trim, different year
We only publish claims we can verify. Cards come from Difetti fault records matched to this vehicle on brand, fuel, engine and generation.