10 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHEthanol Questions
Leading reported evidence
Use same regimen
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that performed work without a confirmed outcome
1
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Leading evidence: 'Use same regimen' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace clutch, you should request they' (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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Suggestion
While they're replacing the clutch, you should request they test the surface quality of the flywheel.
Replace interval has been once a year (2-3k miles)
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
Read evidence and context
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Suggestion · Original poster
Change interval has been once a year (2-3k miles).
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.
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Suggestion
The US 996 was designed and tuned to run on ethanol containing fuels.
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
While they're replacing the clutch, you should request they test the surface quality of the flywheel.
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.
10 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261027T042512Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I have a 2004 40th Anniversary 911 and debating what fuel would be best. My car is all stock and we live in Illinois where most fuel is ethanol blended. Locally I have access to 93 octane with 10% ethanol and I have a couple stations that have 91 ethanol free. Would I be best going ethanol free with lower octane or higher octane with ethanol? Considering the long term effects on fuel system as well as performance. Porsche calls for 93 on the fuel door but understand the computer will compensate for lower octane fuels. I appreciate any thoughts or opinions.
Ethanol Free in my area is at Phillips 66 and Hy-Vee (large supermarket chain). BP and Shell have 93 w/ethanol. Running Mobil 1 w/zinc additive per my local independent Porsche shop. Previous owner used same regimen with Mobil 1. Change interval has been once a year (2-3k miles).
Phillips 66 is registered as Top Tier as well as BP. As I mentioned before, Shell and Chevron would be my first picks, but avoid the "Hy-Vee" supermarket chains for fuel on these cars.
https://www.consumerreports.org/car-...h-extra-price/
Personally, I wouldn't worry about the E10 ethanol in the fuel as much as the other things the can adversely affect this motor.
Question, do you know if the bearing has been updated?
If not, that would be my top priority. While you're having it serviced, you should request a bore scope evaluation. The lokasil bores are prone to scoring. Therefore, if it was my car, I would move away from Mobil 1 oils and to an oil that has an additive packages that are made for these engines like Driven DT40 or even Motul X-Cess 8100 if an A40 oil is important to you.
When you do the bearing upgrade, have the AOS, RMS, and clutch kit replaced. While they're replacing the clutch, you should request they test the surface quality of the flywheel. Doing all of these things while the transmission is dropped for the IMS replacement will save you lots of money in the long run.
Haha, my God! A guy comes in asking about what
fuels
are best for his car, if Ethanol matters or not.
Then immediately gets told he should replace IMS, AOS, RMS, Clutch and while he's in there possibly the flywheel too!
And people still wonder who give these cars their bad rep. Surely not the enthusiast community telling any newcomer their car will grenade unless they spend several thousands of $ in preventative maintenance right this instant.
Sorry for being sarcastic, but this is a bit rich haha.
To answer @jcarr, Ethanol is incompatible with vehicles that use specific (generally old) rubber fuel lines and seals in their system, generally carbureted cars. These rubber lines aren't resistant to Ethanol and will degrade. So as long as you don't have any of that type of rubber in your fuel system, ethanol will not damage, wear or degrade your fuel system. Porsche has stated which models specifically are and are not compatible with E10, and the 996 (and in fact all cars since 1996) are compatible by their own statements. So you can safely pump E10 gas.
The US 996 was designed and tuned to run on ethanol containing fuels. Some US states were mandating ethanol fuels as early as the late 1980's, long before the 996 was built. Drive it and don't worry about it.
Thanks for the reply’s. I am not necessarily a “new owner” but tend to read and research more than post. I purchased my car 2 years after 12 months of research before buying what I felt was the right car from the right owner. I paid for a thorough independent PPI that came back flawless.
Between my dad and I we have several older carbureted cars (pre 1980) that I am sensitive about putting ethanol fuels in and wanted to get some perspectives on 996 era vehicles and potential for fuel system issues.
My bearing has not been upgraded yet but I have planned the actions Nutty Professor spelled out when a clutch is needed. I am around 48,000 miles on the original clutch. The Joe Gibbs oil is also on my list for next oil change.
I am generally very maintenance conscious on anything mechanical from my push mower to the 911, so I feel right at home with the Porsche community’s approach to upkeep of these cars.
I feel the risk of issues associated with the 996 are real and I am not dismissive of the possibility but feel my due diligence pre and post purschase should minimize this as much as possible.
In regards to fuel, I have found this resource for ethanol free gasoline that I have found helpful and may benefit other owners with other pre 1996 vehicles.
https://www.pure-gas.org/index.jsp?stateprov=IL
Glad you know I wasn't trying to alarm you about these cars. Good preventive maintenance will go a lot further that reactive repairs. Seems like you're on the right path to enjoying the car for a long time. Enjoy that car!
This is a source reference. Confirm exact model applicability in the original material.
