17 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHBlue smoke- Bad AOS or valve seal?
Leading reported evidence
Install 100% or engine wasn't cleaned out
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
Sounds like AOS wasn't installed 100% or engine wasn't cleaned out.
Leading evidence: 'Install 100% or engine wasn't cleaned out' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check so much money' (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.
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.
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
The oil used has nothing to do with the appearance of that "buttery stuff" in the oil filler tube.
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
Did you not test drive it before handing out a check for so much money.
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
Blue smoke is from both exhausts and I did just oil change 1 month prior to Mobil Extended Synthetic 5-30W.
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
And both of my car engines have done just fine with 0w-40 oil though I have no problem with anyone using a 5w-40 oil (make that an approved 5w-40 oil) provided the temperature is above -25C.
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.
17 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: 20261027T171335Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Spent $3400 2 weeks ago on 106K 996 to fix driver side oil leak from cam covers, driver side axle seal, and AOS tube. Replaced AOS and did new plugs and coils. Mechanic said substantial oil was in spark plug tubes but plugs looked good. After coming home, had 5-10 secs of substantial light blue smoke on startup after car sat overnight after a hard run. No CELS or other noticeable problems other than blue smoke on startup that tappers off after 6-10 seconds. Car reaches redline with no loss of power when run with no sign of smoke between automatic shifts. Every morning since I've had the blue smoke on startup but after sitting more than 6-7 hours. Oil fill tube has slight vacuum with small amount of scum but I can remove cap and engine only falters slightly when cap is off. Mechanic now waiting for special manometer tool to test for defective AOS. Says may also be leftover oil residue or even bad valve seal. Intake is dry and oil level normal. I searched for valve seal problems here but couldn't find any mentioned. Any ideas of what it might be and what tests to do?
Have you tried to take the oil filler cap off while the engine is idling? From what I understand, if it is impossible to take off, it is a sure sign that the AOS is bad.
That oil would make that much difference? I'm talking 10 secs blue smoke instead of previous 2-3 seconds of white smoke that I assumed was primarily moisture. OK, it's worth a try.
Also how much oil fill tube vacuum is too much...any vacuum whatsoever? It is very slight but noticeable.
If you just got it serviced, I would take it back to your mechanic. Sounds like AOS wasn't installed 100% or engine wasn't cleaned out.
How many miles have you put on it since it got serviced?
IMHO That mechanic saw you coming. You spend almost three and a half grand and you get the car back and it's still smoking. Did you not test drive it before handing out a check for so much money. Obviously not. Take it back and create hell. At that price he should have dropped the engine and stripped it down... dammit. (special manometer tool to test for defective AOS) my ****.
Valve stem seal leaks generally manifest themselves on a hot engine which has been idling for a while, such as pulling away after being stopped at traffic lights for a couple of minutes.
+1 on 5w30 not being the best choice of oil.
The oil used has nothing to do with the appearance of that "buttery stuff" in the oil filler tube. The buttery stuff shows up if the car is not driven enough to get the oil fully up to temperature and keep it at this temperature long enough to drive the moisture out of the oil.
And both of my car engines have done just fine with 0w-40 oil though I have no problem with anyone using a 5w-40 oil (make that an approved 5w-40 oil) provided the temperature is above -25C. In this extremely low temperature Porsche calls out a 0w-40 oil.
Nor do I have a problem with if the ambient temperatures are mild enough if one wants to run a 5w-50 oil (and again make that an approved 5w-50 oil). As I have mentioned before I have switched over both of my car engines to 5w-50 oil year 'round. It seldom gets below freezing here and on the flip side ambient temperatures can soar over 100F sometimes -- late June 2009 -- reaching 111F. And when I venture out onto the open road when I encounter even 118F ambient temperature I don't give the engine a second thought. I fret about the A/C though and offer silent prayers the A/C continues to work ok. Oh do I pray.
I agree with what Mac says but note there was no mention of 5-30 or 0-30 weights. The only oil that ever gave me butter was M1. Long drives and all. I changed to Syntec and later to DT40 and never saw it again. Just my 2 pennies.
Now about the AC I prayed too.
Sorry to turn this to an oil thread thingy....
This is a source reference. Confirm exact model applicability in the original material.
