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Random oscillating oil pressure?

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

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YOUR RESEARCHRandom oscillating oil pressure?

Leading reported evidence

Check level today..not a bit lower

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
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Discussions that performed work without a confirmed outcome: 1

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Performed · outcome unconfirmed · Original poster
Checked the level today..not a bit lower after over 3k miles on the same oil change.
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Random oscillating oil pressure?

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Leading evidence: 'Check level today..not a bit lower' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check level today..not a bit lower' (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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Replace ('02 c4s)

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
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Discussions that performed work without a confirmed outcome: 1

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Performed · outcome unconfirmed
Recently had mine replaced ('02 C4S) after a couple of cases of "heart in mouth".
Original post Read captured discussion
Random oscillating oil pressure?

Replace while rpm was steady

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No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
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Discussions that contain suggestions: 1

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Suggestion · Original poster
Autoenginuity verified that the pressure was changing while rpm was steady.
Original post Read captured discussion
Random oscillating oil pressure?

Frequently discussed actions (3)

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Check level today..not a bit lower

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
Checked the level today..not a bit lower after over 3k miles on the same oil change.
Original post Read captured discussion
Random oscillating oil pressure?

Replace ('02 c4s)

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
Recently had mine replaced ('02 C4S) after a couple of cases of "heart in mouth".
Original post Read captured discussion
Random oscillating oil pressure?

Replace while rpm was steady

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 · Original poster
Autoenginuity verified that the pressure was changing while rpm was steady.
Original post Read captured discussion
Random oscillating oil pressure?

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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.

2 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: 20261026T222516Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Same long 2hour each way trip, all interstate as the speedo post, but something else. Since I've had the car ( 4 months), my trips have been limited to 45 min tops. This was the first long one since I've been familair with the car. Everyone knows that oil pressure varies directly with RPM and oil temp. But once up to temp, the pressure stays solid for a given RPM. After about 1.5 hours on the interstate, I noticed that the pressure, at a given rpm would oscillate occasionally, maybe 0.25 to 0.5 bar, easily visible on the dash pressure gauge. It APPEARED to be related to road irregularities, almost like anything that would make the oil slosh around in the sump would cause a small pressure upset. I may have just never noticed it before, and it may be perfectly normal and why most auto makers damp their pressure readings. Autoenginuity verified that the pressure was changing while rpm was steady. Anyone else notice this phenom? Normal? NO loss of oil or smoke or performance issues at all, in fact got a steady 26mpg averaging 76 (real) mph. Checked the level today..not a bit lower after over 3k miles on the same oil change. Just curious.

POST 2Original post

I know the sending units on these cars can be a P.I.T.A. Recently had mine replaced ('02 C4S) after a couple of cases of "heart in mouth". (Pressure suddenly drops to 0 while driving). You might check that out. Good luck. Cliff

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