9 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH996 Oil Pressure
Leading reported evidence
Check oil and they
Performed · outcome unconfirmed
No successful repair reported for this finding.
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0
Unsuccessful attempts
1
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Read evidence and context
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Discussions that performed work without a confirmed outcome
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Check before i start thinking about an engine rebuild
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 · Original poster
I haven't plugged an oil pressure gauge into the engine direct and that may be the most sensible thing to do but is there anything else worth checking before I start thinking about an engine rebuild?
Leading evidence: 'Check oil and they' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check before i start thinking about an engine rebuild' (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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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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Performed · outcome unconfirmed · Original poster
When they changed the sensor they also changed the oil and filter and used Mobil 1 but not sure of the viscosity.
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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Performed · outcome unconfirmed
The oil reads OK, and was changed in april when I bought th car.
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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Performed · outcome unconfirmed · Original poster
I had it checked out by the local Porsche garage who changed the sensor and claimed everything was fine.
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Performed · outcome unconfirmed · Original poster
When they changed the sensor they also changed the oil and filter and used Mobil 1 but not sure of the viscosity.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Check before i start thinking about an engine rebuild
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
I haven't plugged an oil pressure gauge into the engine direct and that may be the most sensible thing to do but is there anything else worth checking before I start thinking about an engine rebuild?
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.
9 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Porsche Club GB: 1 discussions
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Generation: 20261027T000231Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Would appreciate a little advice from the tech gurus on what appears to be a problem with my 996 C4 Cab Tip. The car is a 99 with 60k on the clock. Should also point out that I live in Dubai! Whilst this is my first post I am not new to 911's as I also have a 993 Targa in UK and have had several others but mainly aircooled variants.
The issue is this:
On start up from cold (bearing in mind ambient temps here)oil pressure is at top of scale.
Within 5 minutes it starts to drop and at 2500rpm is down around 2.5.
When fully warm at idle it barely registers although at 5000rpm it climbs to 3.
I had it checked out by the local Porsche garage who changed the sensor and claimed everything was fine.
I am not so sure!
There are no unusual sounds from the engine and it does not use or leak oil. In fact the car runs very well indeed. I am just freaked out by the sight of the needle being low. My 993 never drops below 2.5 when warm at idle and is at 4+ at motorway speeds when warm.
I haven't plugged an oil pressure gauge into the engine direct and that may be the most sensible thing to do but is there anything else worth checking before I start thinking about an engine rebuild? I suppose the sender could be faulty or the gauge.
Any thoughts would be appreciated
It sounds untypically low to me. What oil are you using? Someone hasn't used a 0W-30 by mistake, have they? I can't see the ambient temperature would make a huge difference to the hot oil pressure. After all, it is water cooled! You should see about 1.0-1.5 bar at hot tickover, and 4.0-5.0 at 5000rpm.
Thanks Richard - that's a good point! When they changed the sensor they also changed the oil and filter and used Mobil 1 but not sure of the viscosity. I will check - what viscosity is recommended? It is the speed at which the pressure appears to drop that has me concerned especially after being high on start. If I had bearing or pump issues I would have expected a more gradual deterioration. Is there a filter in the pump that might be clogged? The car does not overheat at all even when temps are in the 40's and in traffic. Thanks
It should be a 0W-40 or 5W40 for general use. In that environment, I would have thought a 5W-40 would be better, although the pressure you get when "cold" seems to be OK. There is no filter in the pump itself, but there is a pressure relief valve in there, which could cause this problem if the spring has broken. It is reasonably accessible IIRC, so it would only take a short time to change it, and they are less than £5. I would check the oil viscosity first, just in case it is an easy fix.
I also have an oil pressure question. Having read various posts and forums, there seems to be plenty on low pressure or errctic prressue, but not a lot on high pressure. Mine is a 99(T), 996 C2 Tip Cabriolet. On start up the pressure is near 5, and after 85C on the temp, is seems to run between 4 and 5 when at motorway speeds 2500-3000rpm. When ideaingl, anywhere between 1.5 and 2 when at 85C on the temp. The oil reads OK, and was changed in april when I bought th car. Having read the manual, it says 3.5 at 5000rpm, mine does not match that, and while it seems to run fine, I have never had a car with a pressure gauge, and just worried in case the pressure is high, and that I will give it some beans and the engine will pop and loss its oil, and I get a massive bill! Thoughts please?
Checked the oil and they used Mobil 1 OW-40. Think I will try 5W-40 and see what difference that makes before I have a look at the pressure relief valve. Assume this is located in the sump? Any tips on actually doing this or should I take it to the agents? Many thanks for the help.
The oil pump is at the back of the engine, at the bottom. You can see the spring and piston on the diagram (12 & 13). I'm not sure if you can get to it with the engine installed though.
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