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Manometer Reading 5.2"H20 - No Service History on AOS

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

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YOUR RESEARCHManometer Reading 5.2"H20 - No Service History on AOS

Leading reported evidence

Test aos via a manometer

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 · Original poster

On my newly acquired 996.1 I tested my AOS via a manometer.

Original post Read captured discussion
Manometer Reading 5.2"H20 - No Service History on AOS
Frequently discussed work

Replace air oil separator

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

If and when you need to drop the transmission, then you might replace the AOS with a UAOS.

Original post Read captured discussion
Manometer Reading 5.2"H20 - No Service History on AOS
Read full discussion summary

Leading evidence: 'Test aos via a manometer' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace air oil separator' (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 · 6 captured posts examined · 0 partial discussions

Compare 4 other evidence results

Replace air oil separator

Suggestion or failed attempt

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 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

If and when you need to drop the transmission, then you might replace the AOS with a UAOS.

Original post Read captured discussion
Manometer Reading 5.2"H20 - No Service History on AOS

Replace aos even if the current one is working (manometer

Suggestion or failed attempt

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 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

Is it suggested to change the AOS even if the current one is working (manometer test good and no white smoke out the back)?

Original post Read captured discussion
Manometer Reading 5.2"H20 - No Service History on AOS

Run 17s

Suggestion or failed attempt

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 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

Via option code the wheels should be 18th but running 17s for now.

Original post Read captured discussion
Manometer Reading 5.2"H20 - No Service History on AOS

Test good and no white smoke out the back)

Suggestion or failed attempt

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 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

Is it suggested to change the AOS even if the current one is working (manometer test good and no white smoke out the back)?

Original post Read captured discussion
Manometer Reading 5.2"H20 - No Service History on AOS
Frequently discussed actions (5)

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

Replace air oil separator

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

If and when you need to drop the transmission, then you might replace the AOS with a UAOS.

Original post Read captured discussion
Manometer Reading 5.2"H20 - No Service History on AOS

Replace aos even if the current one is working (manometer

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

Is it suggested to change the AOS even if the current one is working (manometer test good and no white smoke out the back)?

Original post Read captured discussion
Manometer Reading 5.2"H20 - No Service History on AOS

Run 17s

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

Via option code the wheels should be 18th but running 17s for now.

Original post Read captured discussion
Manometer Reading 5.2"H20 - No Service History on AOS

Test aos via a manometer

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

On my newly acquired 996.1 I tested my AOS via a manometer.

Original post Read captured discussion
Manometer Reading 5.2"H20 - No Service History on AOS

Test good and no white smoke out the 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 · Original poster

Is it suggested to change the AOS even if the current one is working (manometer test good and no white smoke out the back)?

Original post Read captured discussion
Manometer Reading 5.2"H20 - No Service History on AOS
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.

6 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: 20261026T130754Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hi all, On my newly acquired 996.1 I tested my AOS via a manometer. The test was showing roughly 5-5.2"H2O which is within the good range. I have no history as to when this unit was exchanged, but it may have been at some point. The car is approaching 60k miles. Is it suggested to change the AOS even if the current one is working (manometer test good and no white smoke out the back)? Some people say do it for preventative maintenance, others say to leave it. Any other tests I can do to determine whether I should change it? Thanks

POST 2Original post

If you are going to replace it, replace it with a UAOS with track drain back. It is better quality and has a larger catch can. If the diaphragm ever fails it is also much easier to replace. I put it on all my NA 996s

POST 3Original post

OP - As far as the AOS, I’m in the camp of don’t replace if it’s working correctly. If and when you need to drop the transmission, then you might replace the AOS with a UAOS. And what 996.1? Got any pics?

POST 4 / ORIGINAL POSTEROriginal post

I am inclined to leave it for now then. As it is a complicated job and there is potential for issues with reassembly perhaps its better to just wait until it starts to show excessive vacuum, white smoke or otherwise. I have an OEM extra AOS that I purchased when I got the car as I had planned to do it but will keep it in the box. Here is a picture of the car. 1999 with some sporty options (sport seats, techequipment **** and hand brake trim, lsd, m030 suspension). Via option code the wheels should be 18th but running 17s for now.

POST 6 / ORIGINAL POSTEROriginal post

Quotes source post: 20237233

Appreciate that, thanks!

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