Credov's researched list of the 2 faults the Mercedes-Benz E300 CDI is known for (2005–2008), 2 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: With a torch, look into the back of the engine V and at the bell housing for wet oil.
Why it matters: Oil pools in the V and runs down the back of the engine, giving oil spots, a burning smell and oil-level warnings, and the repair means removing the intake and turbo plumbing, so it is labour-heavy.
What to look for: From cold, check for smooth shifts through every gear, no thump into Drive and no flare between gears.
Why it matters: A failing conductor plate can put the car into limp mode without warning, and while some confused shifting is fixed by a software update or reset, a hard failure needs the valve body or plate replaced.
Got a question about a Mercedes-Benz E300 CDI? 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.