991.1 GTS - Oil consumption
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991.1 GTS - Oil consumption
Hi all -- I've always heard that the Porsche threshold is 1 quart per 1000 miles, but I was wondering how much oil consumtion you are getting on your 991.1 GTS. I use my GTS mostly for weekend fun in country roads (so mid/intensive use, playing in the 3k-6k rpm range). I'd say mine drops 1 bar in the electronic oil level gauge every 600 miles / 1,000 km or so. How about yours? Is that something to worry about?
Last edited by JLCarrera; Dec 10, 2025 at 12:39 PM.
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I changed the oil on my 991.1 C4S at 66k miles in July, the car currently has 67.4k miles and the oil level is the same. I occasionally shift at higher (4-6k) RPMs when i'm by myself but when I have my wife/kids in the car I tend to granny it lol.
Last edited by Misterly1; Dec 10, 2025 at 01:01 PM.
Burning Brakes
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From: Colorado
I haven't owned a 911 with the 9A1 engine, but I've owned a 997.1 with the M97 engine and currently own a 991.2 with the 9A2 engine. My 997 burned about a liter of oil every ~1,500 miles, and my 991 burns virtually no oil.
The key with 911 oil consumption is consistency. If it's dropping slightly every ~600 miles, I'd say you're fine. A large spike in oil consumption can point to a potential problem (failing AOS, bore scoring, etc.) so it's always wise to monitor oil consumption but it doesn't sound like you have anything to worry about.
The key with 911 oil consumption is consistency. If it's dropping slightly every ~600 miles, I'd say you're fine. A large spike in oil consumption can point to a potential problem (failing AOS, bore scoring, etc.) so it's always wise to monitor oil consumption but it doesn't sound like you have anything to worry about.
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I've driven a 991.1 C4S to 140K miles with no oil consumption and my current 991.2 has 80K miles with no oil consumption.
What type and weight of oil are you using. For me I'm using Pennzoil Platinum Euro 5w40
What type and weight of oil are you using. For me I'm using Pennzoil Platinum Euro 5w40
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The Porsche dealer uses the standard Mobil1 0W-40, as it is still under official warranty. How do you use the car? Highway cruising or toy mode?
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From: Miami
Hi all -- I've always heard that the Porsche threshold is 1 quart per 1000 miles, but I was wondering how much oil consumtion you are getting on your 991.1 GTS. I use my GTS mostly for weekend fun in country roads (so mid/intensive use, playing in the 3k-6k rpm range). I'd say mine drops 1 bar in the electronic oil level gauge every 600 miles / 1,000 km or so. How about yours? Is that something to worry about?
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From: Dickson, TN
Highway cruiser and back road bruiser.
I live in middle TN but work in Atlanta .... I'm I'm pretty close to the North GA mountains so I run the twisties a few times a year with groups or weekends when the need arises.
I live in middle TN but work in Atlanta .... I'm I'm pretty close to the North GA mountains so I run the twisties a few times a year with groups or weekends when the need arises.
Last edited by CSK 911 C4S; Dec 10, 2025 at 03:47 PM.
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From: Bainbridge Island, WA
Hi all -- I've always heard that the Porsche threshold is 1 quart per 1000 miles, but I was wondering how much oil consumtion you are getting on your 991.1 GTS. I use my GTS mostly for weekend fun in country roads (so mid/intensive use, playing in the 3k-6k rpm range). I'd say mine drops 1 bar in the electronic oil level gauge every 600 miles / 1,000 km or so. How about yours? Is that something to worry about?
My 2015 GTS uses zero oil, bars have never dropped in the 30k miles I have put on it. It’s a weekend toy.
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I measure my oil via graduates at every oil change. I do not rely on the sensor display. My consumption is under about 200 cc in 2000 mi, my limit of measurement. 2019 C4 GTS, and I drive hard on the backroads but have about 50% "Costco runs" as well, 2 to 3K mi/year.
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I think the 991.2 is less oil thirsty than the 991.1
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My 3.8S
Is changed yearly. 15k miles 2012.5. Never burned a drop. When I change its almost always exactly the same in out. Motul excess gen2, oem brand filter. Any smoke ? A borescope and leak down will tell for sure but even a little scoring does not kill these engines.
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From: Miami
it is. Every engine consumes some oil. The quantity consumption is what matters, and any change in consumption indicates a change internally that should be considered. Porsche states the range of normal consumption at a staggering upper limit of a liter per 1000 KM or Miles, can't remember. I think that is excessive, that's likely oil making it past an oil ring with loose tolerances. I do not believe those saying they've not consumed a drop, perhaps it's just imperceptible, but a running engine moves oil all around and some doesn't return to the sump. And consumption doesn't necessarily mean burning oil, or even leaking, some oil exits the PCV valve into the AOS and is redirected to the intake, unless you have a catch can (it's existence itself is proof that some oil does not return to the sump.) Also, the electronic gauge isn't perfect or very precise. I measure my recaptured oil to ensure it's consistent.