Oil level
Thread Starter
Rennlist Member
Joined: Jan 2021
Posts: 418
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From: Rochester NY
Well added a little less than half a quart and now at 50% up from 25%. Going to keep here for awhile and watch it. Thanks all for the great feed back it has given some “peace of mind”. Best to all!!!
Nordschleife Master
Joined: Jun 2018
Posts: 5,962
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From: Ohio
I just had my 1st Service on my 992.2 base, and the same thing happened. Oil level from factory had always been exactly 100% on all my P-cars and none had ever burned a drop. After the service, my oil level was at 67% after a 4 hour drive home. The next morning it was at 37%. I checked for leaks assuming they'd left the drain plug loose. Nothing, so I called the service dept. They\ said not to worry -the meter on the 992.2 only reads the "last 1/2 quart", like the marks on a dipstick, so 37% didn't mean I had less than half the oil I was supposed to. And suggested adding only 2/10ths of a quart. Makes total sense they don't completely fill a hot engine as overfilling would be bad, and it would take time and refilling to get it right to 100%. I bought a quart and am almost happy to have SOMETHING I can do to my engine. 
But like, it doesnt take that long to get an engine up to temp and read the level and have it squared away before a customer comes.
How many phone calls does it take from customers asking why their level is low.
Rennlist Member
Joined: Jun 2023
Posts: 976
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From: Nature Coast/Deerfield Beach FL
Hopefully you didn't overfill. I would keep an eye on it. It's a very small amount to move the gauge 25%. See below
Last edited by HOTCHKIS; Sep 29, 2025 at 06:29 PM.
Rennlist Member
Joined: Jan 2025
Posts: 106
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From: St. Louis
Here's my logic on keeping the oil near the top, vs. near the bottom: that additional quart (+/-) dilutes the contaminants which is always beneficial. An additional quart adds ~15% more fluid volume, taking the concentration of the contaminants down by ~12%. There's no reason not to do that.
I'm also frustrated by the variability in oil level after service (dealerships & indies). I change the oil ~1x/year and would be inclined to round to whole/half quarts so I'm not working with multiple partially full containers around my garage. Service centers do many oil changes every day and a logical process control measure would be to pre-measure the exact engine oil capacity so every vehicle is correct - ESPECIALLY at a dealer service center. Shame on any service center for rounding down oil refill by the whole quart.
I'm also frustrated by the variability in oil level after service (dealerships & indies). I change the oil ~1x/year and would be inclined to round to whole/half quarts so I'm not working with multiple partially full containers around my garage. Service centers do many oil changes every day and a logical process control measure would be to pre-measure the exact engine oil capacity so every vehicle is correct - ESPECIALLY at a dealer service center. Shame on any service center for rounding down oil refill by the whole quart.
Rennlist Member
Joined: Oct 2018
Posts: 1,258
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From: South East USA
Here's my logic on keeping the oil near the top, vs. near the bottom: that additional quart (+/-) dilutes the contaminants which is always beneficial. An additional quart adds ~15% more fluid volume, taking the concentration of the contaminants down by ~12%. There's no reason not to do that.
I'm also frustrated by the variability in oil level after service (dealerships & indies). I change the oil ~1x/year and would be inclined to round to whole/half quarts so I'm not working with multiple partially full containers around my garage. Service centers do many oil changes every day and a logical process control measure would be to pre-measure the exact engine oil capacity so every vehicle is correct - ESPECIALLY at a dealer service center. Shame on any service center for rounding down oil refill by the whole quart.
I'm also frustrated by the variability in oil level after service (dealerships & indies). I change the oil ~1x/year and would be inclined to round to whole/half quarts so I'm not working with multiple partially full containers around my garage. Service centers do many oil changes every day and a logical process control measure would be to pre-measure the exact engine oil capacity so every vehicle is correct - ESPECIALLY at a dealer service center. Shame on any service center for rounding down oil refill by the whole quart.
on doing your own oil changes, yet in your example of the dealer doing multiple oil changes every day, can you advise what is the "exact engine oil capacity" that should be used? I'm sure you hit the perfect (what ever that is) oil fill level first time, and thus please share the magic oil fill quantity with the rest of us! Never mind that the oil drain quantity may be slightly different each time the oil is changed. And of course all of the above is based on your position that an oil level measurement at 40%-50% in the Acceptable Range is Not a correct oil fill level, even though the manufacturer clearly states that this is fine. And is this pre-measured magic quantity the same for all the different Porsche 991/992/981/718 models, since they mostly all use the same oil these days (Mobil 1 ESP X4 0W-40 A40/C40), as I would guess that the dealer does not want all those partial bottle hanging around their garage, the same as you don't want them hanging around your garage?
Given all these oil level and inventory control problems, you may also wish to consider selling your Porsche if +/- 1/2 quart of oil, while always being in the "acceptable range" makes a difference in the service life of the engine due to the increased concentration level of the contaminants! Lots of members of this forum would probably be willing to take that finicky Porsche off your hands......
Rennlist Member
Joined: Sep 2021
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For the record to all the DIYers, if your OCD wants the oil level at max, there is a definite right and wrong. Filling your oil to the max is wrong. A fill to the max, can turn into an overfilled situation because of heat soak depending of environment, drive style and engine condition.
An over filled engine can put oil into your oil separator and or worst case hydrolock your motor. If youre worried, carry a quart of oil in your luggage compartment. If you dont believe anyone making this point, then be careful.
I measure what came out and consider 1.3L between max and min. Better to add a bit of oil than to need to take some oil out.
An over filled engine can put oil into your oil separator and or worst case hydrolock your motor. If youre worried, carry a quart of oil in your luggage compartment. If you dont believe anyone making this point, then be careful.
I measure what came out and consider 1.3L between max and min. Better to add a bit of oil than to need to take some oil out.
Rennlist Member
Joined: Jan 2025
Posts: 106
Likes: 109
From: St. Louis
If you are worried about the "concentration of contaminants" in you oil, then you may consider changing your oil more frequently. How many miles are your driving between changes?
on doing your own oil changes, yet in your example of the dealer doing multiple oil changes every day, can you advise what is the "exact engine oil capacity" that should be used? I'm sure you hit the perfect (what ever that is) oil fill level first time, and thus please share the magic oil fill quantity with the rest of us! Never mind that the oil drain quantity may be slightly different each time the oil is changed. And of course all of the above is based on your position that an oil level measurement at 40%-50% in the Acceptable Range is Not a correct oil fill level, even though the manufacturer clearly states that this is fine.
And is this pre-measured magic quantity the same for all the different Porsche 991/992/981/718 models, since they mostly all use the same oil these days (Mobil 1 ESP X4 0W-40 A40/C40), as I would guess that the dealer does not want all those partial bottle hanging around their garage, the same as you don't want them hanging around your garage?
Given all these oil level and inventory control problems, you may also wish to consider selling your Porsche if +/- 1/2 quart of oil, while always being in the "acceptable range" makes a difference in the service life of the engine due to the increased concentration level of the contaminants! Lots of members of this forum would probably be willing to take that finicky Porsche off your hands......
on doing your own oil changes, yet in your example of the dealer doing multiple oil changes every day, can you advise what is the "exact engine oil capacity" that should be used? I'm sure you hit the perfect (what ever that is) oil fill level first time, and thus please share the magic oil fill quantity with the rest of us! Never mind that the oil drain quantity may be slightly different each time the oil is changed. And of course all of the above is based on your position that an oil level measurement at 40%-50% in the Acceptable Range is Not a correct oil fill level, even though the manufacturer clearly states that this is fine.And is this pre-measured magic quantity the same for all the different Porsche 991/992/981/718 models, since they mostly all use the same oil these days (Mobil 1 ESP X4 0W-40 A40/C40), as I would guess that the dealer does not want all those partial bottle hanging around their garage, the same as you don't want them hanging around your garage?
Given all these oil level and inventory control problems, you may also wish to consider selling your Porsche if +/- 1/2 quart of oil, while always being in the "acceptable range" makes a difference in the service life of the engine due to the increased concentration level of the contaminants! Lots of members of this forum would probably be willing to take that finicky Porsche off your hands......
As soon as you start your car after an oil change, contaminants go from 0 to >0. By the end of the oil service interval, I'm glad I started nearer the max than the min. Not attempting to hit perfection, just following the capacity in the good book for that routine task.I don't know the oil capacity for various 991/992/981/718, but I know where to look it up and it's the same for each factory-spec vehicle of a model, MY, trim, etc. A little manufacturing experience tells me that if an organization is doing the same thing repetitively, standardizing the use of resources is key. YMMV.
Safe driving. See you out there.
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Rennlist Member
Joined: Jun 2001
Posts: 12,946
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From: North Bay Area, CA
For the record to all the DIY’ers, if your OCD wants the oil level at max, there is a definite right and wrong. Filling your oil to the max is wrong. A fill to the max, can turn into an overfilled situation because of heat soak depending of environment, drive style and engine condition.
An over filled engine can put oil into your oil separator and or worst case hydrolock your motor. If you’re worried, carry a quart of oil in your luggage compartment. If you don’t believe anyone making this point, then be careful.
I measure what came out and consider 1.3L between max and min. Better to add a bit of oil than to need to take some oil out.
An over filled engine can put oil into your oil separator and or worst case hydrolock your motor. If you’re worried, carry a quart of oil in your luggage compartment. If you don’t believe anyone making this point, then be careful.
I measure what came out and consider 1.3L between max and min. Better to add a bit of oil than to need to take some oil out.
More seriously, it's possible to get a bit overwrought on both sides of this discussion. Personally, I see no reason not to have the oil tank or "integrated dry sump" (as Porsche now calls their system for non-GT cars) filled to capacity. Granted, factors like the car being level are definitely important. Temperature less so since the engine has to be at operating temperature with the newer engines to get a reading in the first place. Really extreme temperatures could possibly have an effect although there is almost certainly a margin for error built in; it's not like an ounce over MAX is going to trigger an overfill warning or catastrophic consequences. The most important thing if you want to get a complete fill is to do so in a careful, consistent way and take your time. I've done DIY oil changes in my 911's for 40 years, always filled as close to MAX as possible either on the dipstick or gauge, and never had an overfill situation. OTOH, if you don't want to spend the extra effort or see no benefit in filling to capacity you can obviously feel free to not do so. Keep the oil level between the marks and, all else being equal, your engine will last just as long as mine.
There are lots of choices around driving and maintaining a car. Some people are perfectionists about their vehicles and others not quite so much. For good or ill, I suppose I'm closer to the perfectionist end of the scale. It's a curse. YMMV.
Last edited by Mike in CA; Sep 29, 2025 at 07:17 PM.
Rennlist Member
Joined: Oct 2018
Posts: 1,258
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From: South East USA
LOL you stumped a chump. As soon as you start your car after an oil change, contaminants go from 0 to >0. By the end of the oil service interval, I'm glad I started nearer the max than the min. Not attempting to hit perfection, just following the capacity in the good book for that routine task.
I don't know the oil capacity for various 991/992/981/718, but I know where to look it up and it's the same for each factory-spec vehicle of a model, MY, trim, etc. A little manufacturing experience tells me that if an organization is doing the same thing repetitively, standardizing the use of resources is key. YMMV.
Safe driving. See you out there.
As soon as you start your car after an oil change, contaminants go from 0 to >0. By the end of the oil service interval, I'm glad I started nearer the max than the min. Not attempting to hit perfection, just following the capacity in the good book for that routine task.I don't know the oil capacity for various 991/992/981/718, but I know where to look it up and it's the same for each factory-spec vehicle of a model, MY, trim, etc. A little manufacturing experience tells me that if an organization is doing the same thing repetitively, standardizing the use of resources is key. YMMV.
Safe driving. See you out there.
This whole oil level discussion is a typical Rennlist over-hashed topic....... And just to continue beating the topic and throwing more fuel onto the over-heated fire, lets dissect the following statement: As soon as you start your car after an oil change, contaminants go from 0 to >0. Not quite accurate, since during an oil change there is about 3 liters of contaminated oil left in the engine, so it never starts off with "zero contaminants" unless you do rebuild. Oil change frequency is more important than oil level that is anywhere with-in the Acceptable Range.
My whole point on this topic is that an oil level anywhere in the "Acceptable Range" is fine. Yes, most folks like to keep it above the 50% mark, as do I. Yet I do NOT try to reach the "Max" level, and actually avoid that condition.
So thank you for your good nature and understanding.
Take care
Rennlist Member
Joined: Sep 2021
Posts: 505
Likes: 304
Since 911's come from Zuffenhausen with the oil level at MAX you should perform a public service and contact the factory to inform them that they are doing it wrong.
More seriously, it's possible to get a bit overwrought on both sides of this discussion. Personally, I see no reason not to have the oil tank or "integrated dry sump" (as Porsche now calls their system for non-GT cars) filled to capacity. Granted, factors like the car being level are definitely important. Temperature less so since the engine has to be at operating temperature with the newer engines to get a reading in the first place. Really extreme temperatures could possibly have an effect although there is almost certainly a margin for error built in; it's not like an ounce over MAX is going to trigger an overfill warning or catastrophic consequences. The most important thing if you want to get a complete fill is to do so in a careful, consistent way and take your time. I've done DIY oil changes in my 911's for 40 years, always filled as close to MAX as possible either on the dipstick or gauge, and never had an overfill situation. OTOH, if you don't want to spend the extra effort or see no benefit in filling to capacity you can obviously feel free to not do so. Keep the oil level between the marks and, all else being equal, your engine will last just as long as mine.
There are lots of choices around driving and maintaining a car. Some people are perfectionists about their vehicles and others not quite so much. For good or ill, I suppose I'm closer to the perfectionist end of the scale. It's a curse. YMMV.
More seriously, it's possible to get a bit overwrought on both sides of this discussion. Personally, I see no reason not to have the oil tank or "integrated dry sump" (as Porsche now calls their system for non-GT cars) filled to capacity. Granted, factors like the car being level are definitely important. Temperature less so since the engine has to be at operating temperature with the newer engines to get a reading in the first place. Really extreme temperatures could possibly have an effect although there is almost certainly a margin for error built in; it's not like an ounce over MAX is going to trigger an overfill warning or catastrophic consequences. The most important thing if you want to get a complete fill is to do so in a careful, consistent way and take your time. I've done DIY oil changes in my 911's for 40 years, always filled as close to MAX as possible either on the dipstick or gauge, and never had an overfill situation. OTOH, if you don't want to spend the extra effort or see no benefit in filling to capacity you can obviously feel free to not do so. Keep the oil level between the marks and, all else being equal, your engine will last just as long as mine.
There are lots of choices around driving and maintaining a car. Some people are perfectionists about their vehicles and others not quite so much. For good or ill, I suppose I'm closer to the perfectionist end of the scale. It's a curse. YMMV.
This is from the previous gen 3.0L but consider if you have an oil sump in the engines basement with the separator and all the oil then it doesnt matter what windage and baffling its got, its wet sump. The oil is being held in the bottom half of the engine.
In any case, when Porsche decided that we have to run the car to temp before reading the oil level then thats when the DIYer needs to be careful. That situation and a novices best attempt at hitting full on their first pour is dangerous. If you know what you're doing, its all good with me either way. If a DIY forum asks someone who has worked in the oem automotive sector for a little bit, youre going to get that kind of an answer. Some people think its overthinking...
If you don't overfill it, you set it to the max acceptable, dont track your car, and only drive a few hundred spirited miles than it probably doesnt matter. Youre fine as long as you dont go over filled. Most people have done their diy oil changes on here with no problems, so nothing to overthink. Were talking worst case i guess.
* lol I actually made a dig at my service advisor for filling it to max last service. Thats after the certified technician and advisor billed out and filled my car with the wrong oil. Good thing i caught it.
The OEM & Dealer networks make LOTS of mistakes. Btw, LOTTS!Last edited by 991Targa4S; Sep 30, 2025 at 12:31 AM.
Burning Brakes
Joined: Jan 2023
Posts: 1,175
Likes: 1,063
From: Nashville, TN
I would be weary of adding more. I just did my oil change, I did the 8L - and did a short test drive was around the 70% mark. I randomly check it on my phone app and just checked now and its at 100%. So it seems to fluctuate.
Rennlist Member
Joined: Jun 2023
Posts: 976
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From: Nature Coast/Deerfield Beach FL
Had that happen to me also. Drive it some more and the gauge and the app should be at 70%. Mine stays at 75% now
Burning Brakes
Joined: Oct 2023
Posts: 1,126
Likes: 834
From: West Coast
I've done my oil 3 times now and with my ramps, on my driveway, letting it drain until ~4-5 seconds between drips, it takes exactly 9 quarts to get it to max. Sometimes if I park on an incline it will read 87%.
The first time I did it I started with 8 and it was at the min and I added ~1.4 quarts that time and it came up to max. Second time I started with 9 and it was at max right off. Third time same thing. Only difference was I never saw it drop below max in between that first and second change and after the second and third it would sometimes read 87% after parking at an incline. So it seems to me there is some wiggle room there (not surprising) and while I guess I could try and add a bit more I'm pretty happy with using exactly 9.
The first time I did it I started with 8 and it was at the min and I added ~1.4 quarts that time and it came up to max. Second time I started with 9 and it was at max right off. Third time same thing. Only difference was I never saw it drop below max in between that first and second change and after the second and third it would sometimes read 87% after parking at an incline. So it seems to me there is some wiggle room there (not surprising) and while I guess I could try and add a bit more I'm pretty happy with using exactly 9.