18 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
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YOUR RESEARCHFindings from 996 The Essential Companion
Leading reported evidence
Use during the sunny days into the fall
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They were used during the sunny days into the fall and then thrown into the garage for use next April.
Leading evidence: 'Use during the sunny days into the fall' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'least' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Replace !) over the 12 years and 8,000 miles' (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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Suspected cause
Of all the myriad ways one can blow up a Porsche flat 6, so-called IMS failure is probably the LEAST to be worried about.
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Suggestion
If the car had 1 or 2 oil changes (or no changes!) over the 12 years and 8,000 miles, then run like the wind and never look back.
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Suggestion
If the car had 1 or 2 oil changes (or no changes!) over the 12 years and 8,000 miles, then run like the wind and never look back.
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Suggestion
Did the oil get changed before it went in and when it came out?
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Suggestion
I've been under the impression low millage and seldom used cars were more at risk, than cars driven harder with frequent oil changes reduced the chance on ims failure.?
Use cars were more at risk, than cars driven harder
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Suggestion
I've been under the impression low millage and seldom used cars were more at risk, than cars driven harder with frequent oil changes reduced the chance on ims failure.?
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18 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Thought I'd run this by you guys........based on recommendations I purchased this book and have combed through it. Excellent comprehensive book btw! Anyway, I focused on the discussion about why the intermediate shaft bearing fails. Unless I'm reading it wrongly, the author pretty much states that the failures are almost, if not all, due to driver negligence in the form of either low oil or incorrect oil being used.
For those who've read this book, what are your thoughts about the message?
Great book but it seems that there has been allot more research into the issue since it's publication, you can
SEARCH
here on Rennlist for plenty of info.
It has been hypothesized time and time again that neglect is quite possibly the leading cause of these failures.
Now you must define neglect. A 99 model year 996 with 8,000 miles on it that has sat in a temperture controlled garage its entire life. Was this car neglected? The answer? It depends. Was the oil changed every 6 months or every year regardless of the mileage? If so, the car wasn't neglected, it was just unused.
If the car had 1 or 2 oil changes (or no changes!) over the 12 years and 8,000 miles, then run like the wind and never look back.
My local Porsche tech had a theory that the reason he has seen far more boxsters with issues is that these were summer toys. They were used during the sunny days into the fall and then thrown into the garage for use next April.
Did the oil get changed before it went in and when it came out?
Most would say "What for?!" or "why would you waste the money"? or "I put fuel stabilizer in the the gas tank and a battery tender on the battery, that's all I have to do". All wrong answers
it's not the hard driving as white99 mentions, it's the neglect of proper/timely maintenance during the life of the vehicle. my indi has another opinion, but I won't go there.
Of course the OEM IMS bearing on the M96/M97 engines is a sealed bearing so the changing of the oil has very little effect on it. I agree that if a car has not had regular oil changes, regardless of the age or mileage I would stay away from it (and the old Porsche recommendation of 15K miles between changes was crazy). But unless the seals on the IMS bearing have failed, which is a sign of the bearing going bad, oil changes don't have an impact on the bearing. IMHO
I bought and read The Essential Companion and think it is a great reference. However I don't agree with some (or most) of his conclusions on the known fault of the engine.
Of all the myriad ways one can blow up a Porsche flat 6, so-called IMS failure is probably the LEAST to be worried about. Sticking it in 3rd when you were trying for 5th? Now THAT is something to be worried about!
LV
I've been under the impression low millage and seldom used cars were more at risk, than cars driven harder with frequent oil changes reduced the chance on ims failure.?
Fwiw
