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Leak or Soot Formation on underside of engine ...?

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6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
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YOUR RESEARCHLeak or Soot Formation on underside of engine ...?

Leading reported evidence

Use picture as a reference

Performed · outcome unconfirmed

No successful repair reported for this finding.

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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 performed work without a confirmed outcome
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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.

Performed · outcome unconfirmed · Original poster

I only used his picture as a reference

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Leak or Soot Formation on underside of engine ...?
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Leading evidence: 'Use picture as a reference' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Use picture as a reference' (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.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

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1 matching discussions · 6 captured posts examined · 0 partial discussions

Frequently discussed actions (1)

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

Use picture as a reference

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
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.

Performed · outcome unconfirmed · Original poster

I only used his picture as a reference

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Leak or Soot Formation on underside of engine ...?
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.

6 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: 20261027T013556Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I'm seeing a black residue on the under surface of my engine cover at the highlighted yellow oval (see picture). I'm not sure if it is oil mixed with dust or soot from the exhausts. I don't have a single drop on the driveway. Anyone have any thoughts on this? Thanks Orient Express: I borrowed your image from Renntech, simply because it's so easy to show something on it. I hope you don't mind. ( 2000 C2 (996) 6 Speed 55K miles )

POST 3Original post

Looks nice and clean to me, especially for a 6 year old car!! Roger B.

POST 5 / ORIGINAL POSTEROriginal post

Credit goes to Orient Express for keeping his car clean. I only used his picture as a reference

POST 6Original post

It is impossible to form an opinion about your particular build up without seeing a picture of it. Most cars other than OE's are dirty on the underside so some dirt/soot/etc. is normal. Take a picture of yours and post it, you will likely get a better response.

This is a source reference. Confirm exact model applicability in the original material.