Planet-9

Fact or Fiction - Regular is OK in California

Add to repair workspace

New repair projectOpen repair workspace

Original source

9 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHFact or Fiction - Regular is OK in California

Leading reported evidence

Use 91

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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: 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
I have only used 91 with some 100 before an autocross and have not had any problems.
Original post Read captured discussion
Fact or Fiction - Regular is OK in California

Frequently discussed work

Clean fuel passed through the octane engines

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
Lot's of dirty fuel, lots of clean fuel passed through the octane engines used to measure octane.
Original post Read captured discussion
Fact or Fiction - Regular is OK in California

Read full discussion summary

Leading evidence: 'Use 91' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean fuel passed through the octane engines' (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.

Read captured replies

1 matching discussions · 9 captured posts examined · 1 partial discussions

Compare 4 other evidence results

Clean fuel passed through the octane engines

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
Lot's of dirty fuel, lots of clean fuel passed through the octane engines used to measure octane.
Original post Read captured discussion
Fact or Fiction - Regular is OK in California

Clean has nothing

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
Now, clean has nothing to do with octane.
Original post Read captured discussion
Fact or Fiction - Regular is OK in California

Run anything less

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
I would never even think about running anything less...
Original post Read captured discussion
Fact or Fiction - Regular is OK in California

Run ok in an engine

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
A good friend was advised by his Acura dealer in So Cal that 87 octane would run OK in an engine that should use 91 octane.
Original post Read captured discussion
Fact or Fiction - Regular is OK in California

Frequently discussed actions (9)

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

Clean fuel passed through the octane engines

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
Lot's of dirty fuel, lots of clean fuel passed through the octane engines used to measure octane.
Original post Read captured discussion
Fact or Fiction - Regular is OK in California

Clean has nothing

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
Now, clean has nothing to do with octane.
Original post Read captured discussion
Fact or Fiction - Regular is OK in California

Run anything less

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 never even think about running anything less...
Original post Read captured discussion
Fact or Fiction - Regular is OK in California

Run ok in an engine

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
A good friend was advised by his Acura dealer in So Cal that 87 octane would run OK in an engine that should use 91 octane.
Original post Read captured discussion
Fact or Fiction - Regular is OK in California

Run on 93 octane

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
The Cayman is supposed to be run on 93 octane.
Original post Read captured discussion
Fact or Fiction - Regular is OK in California

Run the computer will compensate

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
The car will run - the computer will compensate for the reduced octane and prevent any detonation, not a problem...
Original post Read captured discussion
Fact or Fiction - Regular is OK in California

Use 87 octane

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
For an Acura, maybe not such a big deal, but you presumably bought your Porsche for it's performance potential, and that performance will not be very good if you're using 87 octane.
Original post Read captured discussion
Fact or Fiction - Regular is OK in California

Use 91

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
I have only used 91 with some 100 before an autocross and have not had any problems.
Original post Read captured discussion
Fact or Fiction - Regular is OK in California

Use 91 octane

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
A good friend was advised by his Acura dealer in So Cal that 87 octane would run OK in an engine that should use 91 octane.
Original post Read captured discussion
Fact or Fiction - Regular is OK in California

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.

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

Planet-9: 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: 20261027T060112Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1Original post

A good friend was advised by his Acura dealer in So Cal that 87 octane would run OK in an engine that should use 91 octane. Has anyone ever tried low octane in their Cayman S? I know some posts refer to much higher octane fuels for performance but none I have seen discuss lower octane fuels. The difference apparently has to do with the alledgedly "cleaner" burning fuel required to prevent pollution. Just curious!

POST 2Original post

The car will run - the computer will compensate for the reduced octane and prevent any detonation, not a problem... it probably won't even hurt the car... but, it will not perform very well. For an Acura, maybe not such a big deal, but you presumably bought your Porsche for it's performance potential, and that performance will not be very good if you're using 87 octane. brad

POST 3Original post

The Cayman is supposed to be run on 93 octane. The computer does compensate for lower octane but it can only do so much. I have only used 91 with some 100 before an autocross and have not had any problems.

POST 4Original post

There is a good discussion on that subject in the Cayman Owners' Manual. Straight from the horse’s mouth.

POST 5Original post

But SF, you said it yourself, there is a shortage of manuals out there.

POST 6Original post

Guys: Let me get my creds out there first. I own a company that audits refineries for compliance with gasoline environmental regulations. I've been working in the oil industry for over 25 years, 15 of them doing the audits. Now, clean has nothing to do with octane. It's great that CARB forces refiners and car manufacturers to dance to their tune, (witness the MTBE ban), but octane has been measured by ASTM D-2699 and D-2700 since Christ was a Corporal. Lot's of dirty fuel, lots of clean fuel passed through the octane engines used to measure octane. So, the Acura dealer is totally wrong. Your Porsche wants steak. Ole Joe

POST 7Original post

I have been looking in on this site for awhile, all the time being incredibly jealous of all the Cayman owners. The great discussions here make me only more excited when I finally get my dream car. But, I am wondering if there is a Cayman site where Sante Fe is not registered. Someone posts a discussion topic and he shoots it down. Very annoying!

POST 8Original post

Please don't be cheap, CA 91 Octane is bad enough for the car, as it is. I'd personally go get it tuned for CA 91 Octane, as these cars are tuned for 93 Octane. I would never even think about running anything less...

POST 9Original post

Thanks to all for the replies. This response is why I think this site is absolutely the BEST! My gut feel was this suggestion was crap but geez, who really knows and there are so many knowledgeable people on this site. :cheers:

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