Skalas
New Member
- Joined
- Jun 2, 2025
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- Your Mercedes
- CLA 200/ 2013/ M270 1.6l
Hello everyone,
I drive a 2013 Mercedes CLA 1.6L Petrol (W117/C117). M270 Engine
About six months ago, my alternator failed and was refurbished by a mechanic. Since then, it’s been working fine without any issues. While the car was in for repairs, I also had them inspect the timing chain due to a noticeable rattle during cold starts. They ended up replacing the timing chain.
Recently, however, I’ve started noticing a strange noise under specific conditions. What’s odd is that the car actually performs better when cold compared to when it’s at operating temperature.
The noise itself is quite distinct — a rattling or grinding sound — and appears when the engine reaches approximately 60°C and up. It lasts for about 5–10 minutes and then disappears completely. Here’s a breakdown of the situation:
Given all this, I suspect the issue could be related to oil pressure or viscosity — especially since the problem begins at a certain engine temperature and then goes away.
I’ve attached a video of the noise for reference. If anyone has experienced something similar and managed to resolve it, I’d really appreciate your input.
Thanks in advance!
I drive a 2013 Mercedes CLA 1.6L Petrol (W117/C117). M270 Engine
About six months ago, my alternator failed and was refurbished by a mechanic. Since then, it’s been working fine without any issues. While the car was in for repairs, I also had them inspect the timing chain due to a noticeable rattle during cold starts. They ended up replacing the timing chain.
Recently, however, I’ve started noticing a strange noise under specific conditions. What’s odd is that the car actually performs better when cold compared to when it’s at operating temperature.
The noise itself is quite distinct — a rattling or grinding sound — and appears when the engine reaches approximately 60°C and up. It lasts for about 5–10 minutes and then disappears completely. Here’s a breakdown of the situation:
- The noise is present whether the car is in neutral or drive, which rules out the gearbox and driveshaft.
- Heat shields have been checked and are securely fastened.
- Engine mounts are in good condition.
- Oil levels are within spec.
- Oil type: This might be a potential issue. The mechanic made a few mistakes during the job, so the wrong oil may have been used. I’m planning to do an oil change soon and will switch to the correct spec (MB 229.5).
- Additives used: I added Liqui Moly Hydraulic Lifter Additive (can’t say if it helped) and Liqui Moly Injection Cleaner just in case.
Given all this, I suspect the issue could be related to oil pressure or viscosity — especially since the problem begins at a certain engine temperature and then goes away.
I’ve attached a video of the noise for reference. If anyone has experienced something similar and managed to resolve it, I’d really appreciate your input.
Thanks in advance!
