Credov's researched list of the 3 faults the Mercedes-Benz C 350 is known for (2005–2007), 3 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: On a cold start listen for front-of-engine rattle, and check the engine serial number is outside the affected range.
Why it matters: Because the balance shaft sits at the back of the engine, the repair usually needs the engine and gearbox out, costing thousands of dollars on a car that may be worth far less.
What to look for: On the drive, feel for weak pickup from low revs and a lumpy idle, and check for an engine light.
Why it matters: Mercedes sells only the complete manifold assembly as a replacement part, though cheaper aftermarket metal repair kits exist; left broken, the car loses low and mid-range power.
What to look for: Start the car several times from cold and hot, feeling for any delay, click or pause before it fires.
Why it matters: A failed ESL can leave the car needing a tow with no warning, and the repair - a new ESL coded to the car, sometimes with the ignition switch - is a few hundred to over a thousand dollars.
Got a question about a Mercedes-Benz C 350? 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.