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

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Leading reported evidence

Replace "cat", $1000 my cost

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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
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Suggestion

When I took factory delivery of my 2001 C4 I was told that in my travels in europe I would not always be able to obtain premium fuels and that would be no problem, just avoid leaded fuel or they would need to replace the "cat", $1000 my cost, before subsequent shipping to the US.

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Leading evidence: 'Replace "cat", $1000 my cost' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace "cat", $1000 my cost' (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 · 18 captured posts examined · 0 partial discussions

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Run back

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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
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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.

Suggestion

Just go blow it all out, up and back to Blowing Rock, add premium at the top of the hill and run back.

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Run buddy

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

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Suggestion

Time for a mountain run buddy.

oops...

Use 91 and it works fine

Suggestion or failed attempt

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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 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

Either way, you'll be fine--93 octane is impossible to find around here, so I sometimes have to use 91 and it works fine.

oops...

Use efi

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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 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

But my belief is that since the adoption/use of EFI the way that has been used to prevent knocking in high compression engines "requiring" premium is to enrich the mixture using EFI when low grade fuels are used.

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Frequently discussed actions (6)

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

Replace "cat", $1000 my cost

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

When I took factory delivery of my 2001 C4 I was told that in my travels in europe I would not always be able to obtain premium fuels and that would be no problem, just avoid leaded fuel or they would need to replace the "cat", $1000 my cost, before subsequent shipping to the US.

oops...

Run back

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

Just go blow it all out, up and back to Blowing Rock, add premium at the top of the hill and run back.

oops...

Run buddy

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

Time for a mountain run buddy.

oops...

Use 91 and it works fine

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

Either way, you'll be fine--93 octane is impossible to find around here, so I sometimes have to use 91 and it works fine.

oops...

Use efi

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

But my belief is that since the adoption/use of EFI the way that has been used to prevent knocking in high compression engines "requiring" premium is to enrich the mixture using EFI when low grade fuels are used.

oops...

Use of efi the way

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

But my belief is that since the adoption/use of EFI the way that has been used to prevent knocking in high compression engines "requiring" premium is to enrich the mixture using EFI when low grade fuels are used.

oops...
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.

18 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: 20261026T191851Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

filled her up with the low octane cheap stuff by accident today. Is that a big issue? Should I put an additive in, or will all be ok?

POST 2Original post

I'd say drive it normally and no high rpms. The timing will retard anyway if detonation occurs -- which is unlikely if you drive "normally."

POST 3Original post

Time for a mountain run buddy. Just go blow it all out, up and back to Blowing Rock, add premium at the top of the hill and run back. I'd join you, but I'm taking my first-born to college today. Yikes!

POST 4Original post

syphon that stuff out and use it in the lawn mower!

POST 5Original post

I once heard you can buy toluene at the hardware store to increase the octane. Not a chemist by any means though. Stefan

POST 7 / ORIGINAL POSTEROriginal post

We've got a funny crowd going this morning! Seriously, any issues or no problem? Thx!

POST 8Original post

Couldn't you just dump a can of octane booster into the tank if you're really worried about it? Either way, you'll be fine--93 octane is impossible to find around here, so I sometimes have to use 91 and it works fine.

POST 9Original post

I'm in the no problem camp. You can't buy 93 octane in AZ so I've been driving with sub-optimal 91 for the life of the car. Have fun burning up that tank. Report back to the forum what performance differences you notice.

POST 10Original post

89-91... there's a relatively small difference...and the ECU will adapt its timing when you put 89...albeit you'll lose some power because of it.

POST 11Original post

When I took factory delivery of my 2001 C4 I was told that in my travels in europe I would not always be able to obtain premium fuels and that would be no problem, just avoid leaded fuel or they would need to replace the "cat", $1000 my cost, before subsequent shipping to the US. But my belief is that since the adoption/use of EFI the way that has been used to prevent knocking in high compression engines "requiring" premium is to enrich the mixture using EFI when low grade fuels are used.

POST 12Original post

Isn't that what causes or accelerates cylinder slip in the MkI's?!?!

POST 14Original post

From that there manual-thingy that comes with these cars: Since you likely had some premium fuel left in your tank when you went to fill up, the resultant mix is probably pretty close to 90 octane anyway - I think you'll be fine. If your really concerned burn half the tank then fill it up with premium again. - Nick

POST 15Original post

Cheap gas and knock off pedals. What gives? Please don't tell us your retread tires are starting to wear out too.

POST 16 / ORIGINAL POSTEROriginal post

Quotes source post: 4472075

[Image-only post; no author-written text. Original image references:] https://rennlist.com/forums/graemlins/roflmao.gif https://rennlist.com/forums/graemlins/roflmao.gif

POST 17Original post

Don't worry about it - you won't hurt your engine. If it still bothers you, then go get some octane booster. Otherwise, you probably won't even notice it.

POST 18Original post

BoulderNick well said...... +1, nobody ever looks at that manual thing!

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