While checking my oil level I noticed this......
Senior Member
Joined: Dec 2025
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From: Keep it simple - keep it OEM
AMG C63s Coupe
Doubble check cooling fluid … show us a picture.
Correct MB specification ? correct mix of fluid and ( destilated) water ?
check cap … check if there is a new partnumber.
check cooling system if it works correct.
tell us about your car - OEM or abused ?
Correct MB specification ? correct mix of fluid and ( destilated) water ?
check cap … check if there is a new partnumber.
check cooling system if it works correct.
tell us about your car - OEM or abused ?
Last edited by C63s_Jack; Mar 26, 2026 at 03:38 AM.
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From: Baltimore County, MD
'13 s212 63 p30. '06 LX470
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C7 Z06
Correct fluid, tank filled to the black half starts. Cooling system works fine.
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Joined: Dec 2025
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From: Keep it simple - keep it OEM
AMG C63s Coupe
How have checked that fluid is oem MB spezification ?
It looks like cooling fluid came to the cap outside.
thats not normal in my mind.
I would guess cap has a problem or engine gone to hot.
you can check cooling fluid by a gauge.
( how much F or C it has)
Last edited by C63s_Jack; Mar 26, 2026 at 11:00 AM.
Super Member
Joined: Mar 2019
Posts: 595
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From: NYC area
2019 C63S Coupe
Next morning before proceeding to dealership, opened hood and realized the cap was not fully secured. I turned cap until it clicked. I had a Service done a few months earlier and thinking a careless tech may not have fully secured the cap.
Drove to dealership anyway and tech was waiting and performed a pressure check, cleaned up the white crust and said it was just a loose cap. Didn't think I needed a new cap but said keep an eye on it.
That was it and no futher issues. However sometime later, I purchased a new cap since car was 4-5 years old. And no more issues..
Last edited by jj18; Mar 26, 2026 at 02:06 PM.
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Joined: Feb 2025
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From: SEPA
2021 C63S AMG
JB4 = a module that acts something like a tune for the car. Plugs into your existing wiring harness, and to my understanding, hijacks some of your ECU signals and replaces them with others. See link below.
https://burgertuning.com/products/me...3ZzlqmKrpP_wT1
https://burgertuning.com/products/me...3ZzlqmKrpP_wT1
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Senior Member
Joined: Dec 2025
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From: Keep it simple - keep it OEM
AMG C63s Coupe
okay i know what you mean.
i know them as tuning box.
thats realy old style because they are not so fine definated as tuning with SW tuning to the engine modul itself. ( sw/computer/engine modul/new setup for all parameter)
i know them as tuning box.
thats realy old style because they are not so fine definated as tuning with SW tuning to the engine modul itself. ( sw/computer/engine modul/new setup for all parameter)
Last edited by C63s_Jack; Mar 26, 2026 at 05:13 PM.
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Posts: 50
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From: SEPA
2021 C63S AMG
The advantage is that you can run one without updating the ECU. If you're trying to avoid tipping MB off to the fact you've modified the car, the JB4 is a viable choice.
