10 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHOil consumption/condition of engine?
Leading reported evidence
Replace their consumption allowance
Performed · outcome unconfirmed
No successful repair reported for this finding.
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0
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1
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Read evidence and context
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Performed · outcome unconfirmed
I believe Porsche changed their consumption allowance because of this 928....
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Suggestion
Porsche sent technicians over to inspect car, sealed engine with super secret whatever(so no oil could be taken out or added) to test it and sent him to drive.
Leading evidence: 'Replace their consumption allowance' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Inspect car, sealed engine' (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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Performed · outcome unconfirmed
I became intimately involved in these numbers with the factory as my car initially used (in my mind-not thiers) alot of oil.
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
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Discussions that contain suggestions
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Suggestion
Porsche sent technicians over to inspect car, sealed engine with super secret whatever(so no oil could be taken out or added) to test it and sent him to drive.
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
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Suggestion
The factory does not describe the figure as a "recommended" maximum oil consumption.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Inspect car, sealed engine
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1
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Suggestion
Porsche sent technicians over to inspect car, sealed engine with super secret whatever(so no oil could be taken out or added) to test it and sent him to drive.
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: 20261027T013556Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Does anyone know if there is any direct correlation between the two? My '99 C4 does not seem to comsume ANY oil between services (maybe 1 litre per 8k miles). I had bought it used a few months back.
Does this mean the previous owner ran the engine in with kid gloves, thereby ensuring all seals & joints bedded in perfectly?
What oil consumption does everyone else get?
I don't know about the water cooled motors, but there is apparently wide variation in oil consumption among the later (last ten years) air sucking models. Some owners have reported less than a quart (or liter) added between oil changes, while others have reported adding as much as a quart every 1000 miles or so. What seems interesting is that several have reported that their oil consumption has remained fairly steady from very early on. In other words, some apparently healthy engines naturally use more oil than other apparently healthy engines from the very start. I don't remember anyone reporting as little as 1 quart or liter per 8k miles, however. So I would definitely consider that level of consumption (or non-consumption) to be at one extreme. I don't think that means that the low consumption was necessarily caused by the previous owner doing everything perfectly, however. I've even heard someone argue that healthy engines are supposed to use some oil. As engines age and wear, they will use more oil, of course, and excessive oil usage is often a cue for engine work. For the old air suckers, I think Porsche said 1 quart per 800 miles would not necessarily be considered excessive, but if one had at one time been going 1600 miles per quart, the higher consumption may indicate up-coming engine work.
I have a friend with a 1995 928GTS 5 speed that he purchased new, it now has 16K miles and goes through a quart every 400 miles!! Thats right four hundred. Porsche sent technicians over to inspect car, sealed engine with super secret whatever(so no oil could be taken out or added) to test it and sent him to drive. Low and behold, down a full quart after 400 miles. Not leaking, consuming. I believe Porsche changed their consumption allowance because of this 928....
About the only time I do add oil is when I go to track-add about 3 cap fulls for the day just for safe purposes. Other then that haven't noticed any loss of oil other then first TSB for RMS. Regards. Mike
[quote]Originally posted by laurence '97 C4S:
<strong>On the 993, factory spec. on oil consumption is 1 qt. per 620 miles (1,000 km). I have no idea what the 996 spec. is.</strong><hr></blockquote>
I believe that is the recommended maximum consumption figure.
Christer-
The factory does not describe the figure as a "recommended" maximum oil consumption. Porsche simply states the consumption of 1qt./600 miles as spec. Porsche is very careful not to state ranges of oil consumption. I believe the factory takes this position because a tight band on oil consumption (between healthy engines) does not exist. Oil consumption figures are all over the place. Therefore, from the factory's perspective, an engine is with in their specification's (and healthy, therefore) if it consumes 1 qt. / 600 miles.
I became intimately involved in these numbers with the factory as my car initially used (in my mind-not thiers) alot of oil.
FWIW,
My 2000 C4 uses essentially no oil between changes. It has 34,000 miles on it. For that matter my '89 928 GT also does not consume oil between changes and it has 92,000 miles on it. Both vehicles use mobil 1 and get a change every 5000 miles.
This is a source reference. Confirm exact model applicability in the original material.
