Oil Pressure, 997.1
04-16-2019, 12:18 AM
#16
Rennlist Member
When the oil is warm, 200 degrees, what pressure do you see at idle?
When the car is at 3k rpm what do you see?
The pressure is kind of dependent on the rpm so seeing 5bar Oil Pressure at 3.5k RPM is normal.
Seeing 5 bar on cold oil is normal.
It's fine, even preferred by some to run the oil below the full mark I aim for mid way.
I only add oil wen the warning light comes on. It's better to run a little low than a little high.
When the car is at 3k rpm what do you see?
The pressure is kind of dependent on the rpm so seeing 5bar Oil Pressure at 3.5k RPM is normal.
Seeing 5 bar on cold oil is normal.
It's fine, even preferred by some to run the oil below the full mark I aim for mid way.
I only add oil wen the warning light comes on. It's better to run a little low than a little high.
Awesome information everyone, thanks! The Bruce, you described perfectly my exact circumstances and I would be inclined to follow your remedy suggestion. I am not necessarily equipped with "tools" but I am willing to learn and in fact, want to get more involved with some basic home maintenance for education and cost savings!
I checked oil levels during the event and discovered I was one segment below the full reading. After I got home, I rechecked, had the same reading, and added the appropriate amount of oil to bring it back to the full level.
During driving, like today for example, when letting off the accelerator into my parking lot at work, the gauge dropped from 5 down to around 3.5ish, floated up to 4 on throttle and then again back up to 5 where it has been when back on the gas.
I checked oil levels during the event and discovered I was one segment below the full reading. After I got home, I rechecked, had the same reading, and added the appropriate amount of oil to bring it back to the full level.
During driving, like today for example, when letting off the accelerator into my parking lot at work, the gauge dropped from 5 down to around 3.5ish, floated up to 4 on throttle and then again back up to 5 where it has been when back on the gas.
04-16-2019, 01:06 AM
#17
Three Wheelin'
After reading through this again and seeing my oil pressure gauge at 1 1/2 bar with the engine off and sitting overnight, I decided to call my indy again to ask about it. He said it is not uncommon for a car to show residual oil pressure even after sitting overnight or longer.
@turbodogs02 - the manual doesn't have much specified on this topic except for "pressure should be a minimum 3.5 bars at 5k rpm". My pressure will typically be 4-5 bars when im on the gas. Oil temp has a big impact on the pressure e.g. when the engine is cold and the oil is more viscous I will show 5 bars when idling; however, as it gets up to operating temp it will idle around 1.5 bars. And, if im blasting through the hills with my oil temp at 225F it will idle around 1 bar. I polled some 997.1 owners and most said their cars idled between 1 and 3 bars at 200F, so I think everyone gauge has some variation.
What you typically should see during AutoX is your oil pressure decreasing as the oil losses viscosity. If you are seeing the opposite its something to investigate.
04-16-2019, 01:34 AM
#18
@G.I.G. I've seen residual pressure before but its only been for a minute or two, typically if you start the car then shut down, and restart. If you gauge is reading 1.5 bars with the engine off its likelya bad gauge.
04-19-2019, 03:40 PM
#21
Instructor
Thread Starter
*** update ***
Ok, so I had an oil change done yesterday at my local indy shop. I've been driving the car all week, and the previous weekend, and on Tuesday of this week the oil pressures appeared to be resuming normal operations. Wednesday I again confirmed that everything seemed to be back to normal, i.e. 5 bar under throttle, back down to between 3.5 or less at idle and with a warm engine. After explaining what had been going on previously but mentioning that things seemed fine again, indy changed the oil and found nothing out of the ordinary. I should add here that I didn't have them pull the oil pan or anything further, as I wanted to just start with the basic service and see what they thought. They didn't seem to alarmed, and with everything seemingly back to standard operations, I guess neither am I. Given the wide range of, but generally the same, oil pressures everyone has mentioned it would seem I'm in the ok range too.
Ok, so I had an oil change done yesterday at my local indy shop. I've been driving the car all week, and the previous weekend, and on Tuesday of this week the oil pressures appeared to be resuming normal operations. Wednesday I again confirmed that everything seemed to be back to normal, i.e. 5 bar under throttle, back down to between 3.5 or less at idle and with a warm engine. After explaining what had been going on previously but mentioning that things seemed fine again, indy changed the oil and found nothing out of the ordinary. I should add here that I didn't have them pull the oil pan or anything further, as I wanted to just start with the basic service and see what they thought. They didn't seem to alarmed, and with everything seemingly back to standard operations, I guess neither am I. Given the wide range of, but generally the same, oil pressures everyone has mentioned it would seem I'm in the ok range too.
04-19-2019, 03:46 PM
#22
My gauge has worked intermittently for a few years now. Sometimes it's always pegged at 5. When it's working it works well per the manual's specifications. Haven't bothered to get around to fixing it - I'm usually more focused on the oil temp.
04-19-2019, 04:31 PM
#24
Instructor
Thread Starter
05-02-2021, 01:59 PM
#26
Reviving an old thread, but glad to see it here. I bought my '08 T4S in Indiana a few months ago, flew up there, and drove it home to Austin, TX over a long weekend. It was a wonderful intro to my first 911, but I was fretting the oil situation the whole time. Meaning well (to have the car perfect for me) the PO WAYYY overfilled the oil. I learned about this the day after, and threatened his very life to go get it drained to the correct level.
I arrived in IN the next morning to find the oil level at the top of the guage - I was good with that. From there on, I maniacally checked the oil every 100-150 miles. Readings after different idle times yielded wildly varying measurements - was it burning oil, OMG bore scoring!; was it underfilled, OMG catastrophic failure! on and on...
On the first morning, at the hotel in Memphis, the bottom oil bar was flashing. Holy crap! What have I done?!? It took 1.5 quarts before it settled in at the middle of the guage. Off I went, with my stomach churning the whole time. Again, stop and check every 100-150 miles, knowing a had a frunck full of Mobil 1 bottles just in case. Have I bought a time bomb? The oil level has never moved again. Damn the temp, damn old or new oil, damn time sitting, rock solid one bar below full. Phew!
Now to this thread - my oil pressure are rarely consistent or predictable. After the oil level settled in on my road trip, it was pretty good -1.5bar at idle, 4 at 4k, commensurate at rpms in between. Since being home, 1, 3, 5 bars at idle; 3, 4, 5 at speed who knows what you'll get. Same before and after oil change at my indy. They cut open the filter and said it was clean as a whistle and that was a great car. I've since stopped worring about pressure, but watch the (rock solid) level closely. Although I've stopped worrying about the pressure, I sure would like it to perform like any other car I've ever owned, like my old a** Jeep or Cayenne TT.
Long walk on a short pier to the question... Should I experiment and change the oil pressure sensor, do another oil change to flush things out, or just tape over the pressure guage and drive blissfully unaware?
I arrived in IN the next morning to find the oil level at the top of the guage - I was good with that. From there on, I maniacally checked the oil every 100-150 miles. Readings after different idle times yielded wildly varying measurements - was it burning oil, OMG bore scoring!; was it underfilled, OMG catastrophic failure! on and on...
On the first morning, at the hotel in Memphis, the bottom oil bar was flashing. Holy crap! What have I done?!? It took 1.5 quarts before it settled in at the middle of the guage. Off I went, with my stomach churning the whole time. Again, stop and check every 100-150 miles, knowing a had a frunck full of Mobil 1 bottles just in case. Have I bought a time bomb? The oil level has never moved again. Damn the temp, damn old or new oil, damn time sitting, rock solid one bar below full. Phew!
Now to this thread - my oil pressure are rarely consistent or predictable. After the oil level settled in on my road trip, it was pretty good -1.5bar at idle, 4 at 4k, commensurate at rpms in between. Since being home, 1, 3, 5 bars at idle; 3, 4, 5 at speed who knows what you'll get. Same before and after oil change at my indy. They cut open the filter and said it was clean as a whistle and that was a great car. I've since stopped worring about pressure, but watch the (rock solid) level closely. Although I've stopped worrying about the pressure, I sure would like it to perform like any other car I've ever owned, like my old a** Jeep or Cayenne TT.
Long walk on a short pier to the question... Should I experiment and change the oil pressure sensor, do another oil change to flush things out, or just tape over the pressure guage and drive blissfully unaware?
05-02-2021, 08:20 PM
#27
Burning Brakes
After reading through this again and seeing my oil pressure gauge at 1 1/2 bar with the engine off and sitting overnight, I decided to call my indy again to ask about it. He said it is not uncommon for a car to show residual oil pressure even after sitting overnight or longer.