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Oil fill, coolant residue

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5 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHOil fill, coolant residue

Leading reported evidence

Clean its threads, and the tank's threads

Suggestion or failed attempt

No successful repair reported for this finding.

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Suggestion

Take the cap off, clean its threads, and the tank's threads, then spray a little silicone lubricant on the threads of the cap and on the rubber gasket in the bottom of the cap.

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Oil fill, coolant residue
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Leading evidence: 'Clean its threads, and the tank's threads' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean its threads, and the tank's threads' (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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Lubricate cap makes it easier

Suggestion or failed attempt

No successful repair reported for this finding.

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Reported fixes
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Unsuccessful attempts
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Discussions
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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

Lubricating the cap makes it easier to close it fully.

Original post Read captured discussion
Oil fill, coolant residue
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.

Clean its threads, and the tank's threads

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

Take the cap off, clean its threads, and the tank's threads, then spray a little silicone lubricant on the threads of the cap and on the rubber gasket in the bottom of the cap.

Original post Read captured discussion
Oil fill, coolant residue

Lubricate cap makes it easier

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

Lubricating the cap makes it easier to close it fully.

Original post Read captured discussion
Oil fill, coolant residue
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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.

5 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: 20261026T181445Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

A great day of wash and drive; finally mother nature has remembered what season it is in NJ. It was time to add some oil, and visually inspect. After removing the cap, I noticed residue (like baby spitup) sitting in the shaft. Also, my coolant resevoir has "cake" around the cap and I see it is low. Your input is appreciated, Gary 2004 CAB Black/Basalt

POST 2Original post

You should replace your coolant cap, especially if you are steadily losing small amounts of coolant. Not sure about the oil - I think a little foam is OK but beyond that, not sure.

POST 3Original post

The oil vomit is from moisture condensation in the crankcase. Cold start-ups when the car is parked outside can cause this, or if the car is driven for short periods of time. Not a big deal, looks bad, but it is not. Just wipe it off of the oil filler cap if it bugs you. Or take it out and drive the **** out of the car for a few hours, that will get rid of the moisture too! The crud around the coolant expansion tank cap is dried coolant. Make sure that your cap has a part number that ends in -01 or higher. Early caps had a sealing problem. The other issue is that the cap is not fully closed. Take the cap off, clean its threads, and the tank's threads, then spray a little silicone lubricant on the threads of the cap and on the rubber gasket in the bottom of the cap. When screwing on the cap, make sure that it stops with the cross on the cap at 12/3/6/9 position. Many times the cap gasket binds just as it seats, and the cap is not turned the last 1/8th of a turn. This can cause the coolant to weep out. Lubricating the cap makes it easier to close it fully.

POST 4Original post

entirely normal-- it is condensation indicative of short trips. my dealer said all 911's, whether air or water cooled, exhibit this trait.

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