Credov's researched list of the 2 faults the Mercedes-Benz C 320 CDI / C 350 CDI W204 is known for (2005–2010), 0 of them serious or costly. Each one says what to look for when you check the car, so you can spot it before you buy. Not every car has these faults: they are the ones worth checking on this model.
What to look for: Look between the cylinder heads at the back of the engine for pooled oil, and smell for burning oil after the drive.
Why it matters: The cooler sits under the intake manifold in the valley - a long labour job, and a leaking valley is a common reason for these cars to be sold on.
Sources: 1
What to look for: Drive and feel whether the engine won't rev past about 3000 rpm, and look for oil on the intake flap motors.
Why it matters: Cheap if it is only the fuse, costly if the motors and manifolds are gunged up; either way it points to a neglected crankcase-vent system.
Sources: 1
Got a question about a Mercedes-Benz C 320 CDI / C 350 CDI W204? Ask Credov: a noise, a warning light, a part or how to fix it.
On top of the faults above, every Credov inspection covers the basics: fuel smell, leaks or filler rust, engine oil leaks, power steering fluid leak, drive belt cracks or squeal, rust underneath: chassis and mounts, engine mounts, engine oil level and colour, coolant level, colour and leaks, head gasket failure signs, cold start: rattle, knock or smoke, rough or hunting idle, engine running hot on gauge, gearbox or diff oil leak, swapped gearbox without lvv and more.
Researched by Credov from manufacturer recalls and service bulletins, owner reports and workshop sources. Repair prices are typical ranges, not quotes. See also fault codes and repair costs.