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Strange noise C4S Tiptro

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3 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHStrange noise C4S Tiptro

Leading reported evidence

Replace diff oil and see if you have any debris

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
I would suggest to change the diff oil and see if you have any debris on the magnetic plug.
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Strange noise C4S Tiptro

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Leading evidence: 'Replace diff oil and see if you have any debris' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace diff oil and see if you have any debris' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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1 matching discussions · 3 captured posts examined · 0 partial discussions

Compare 1 other evidence results

Replace then you should look elsewhere

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
If the sound doesn't change then you should look elsewhere.
Original post Read captured discussion
Strange noise C4S Tiptro

Frequently discussed actions (2)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Replace diff oil and see if you have any debris

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
I would suggest to change the diff oil and see if you have any debris on the magnetic plug.
Original post Read captured discussion
Strange noise C4S Tiptro

Replace then you should look elsewhere

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion
If the sound doesn't change then you should look elsewhere.
Original post Read captured discussion
Strange noise C4S Tiptro

Coverage and how to read this overview

Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

3 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

Rennlist: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261027T064914Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hello, On C4S 2003 Tiptro. Like you can hear in attachement, on road I have this kind of whistling. The noise fluctuates when the gears change or when I accelerate. I tried without air conditionner, and the head unit off. The same

POST 2Original post

I don't hear anything concerning. I have a 99 C2 with the Tiptronic. It does not make the same sound as your but it does have some gear whine. I think mine is a different make though, ZF vs Mercedes?

POST 3Original post

I would suggest to change the diff oil and see if you have any debris on the magnetic plug. The tiptronic gearbox has a lot of bearings that are easy to replace, I have posted a lot of photos in another thread. Changing the diff oil is something you should do in any car that is 25 years old... If the sound doesn't change then you should look elsewhere. Some more questions: 1. If in neutral and revving, do you get the same sound? 2. If coming down a cliff, put the gearbox in neutral and tell us if the sound is there while rolling.

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