DishoomX2

Thanks to helpful guides and YouTube videos, I was able to change the oil on my 2012 991.1 Carrera S on Saturday. Everything was pretty straight forward, but as others have mentioned, it can be a PITA to get an oil reading on this car.

I initially added 6 quarts of Mobil 1 0W-40, and after driving around my neighborhood (under 15mph) and getting it warmed up to 194F, I found out that the oil level was below minimum. I then added another half quart (total 6.5 qts), drove around, and found that I was at the minimum level. I repeated the process with another half quart (total = 7qts) and the reading did not change. Again I add another half quart (total = 7.5qts), and at this point, the reading indicates "Oil level OK," which is the first green bar from the bottom. How much more oil is needed at this point? I don't want to overfill.

Cyberbug

My research on this forum has indicated with a filter change and proper drain - it takes 8-9 qts.

So recommendation is to put in 8 qts. and then check.

iWrenchmy911

you start with 8 quarts then run the Piwis oil fill diagnostic, which tells you exactly how much more to add. No other way to get it exact I'm afraid.

Sidvicious7

+1 ^ My Porsche mechanic told me exactly the same. The only way to know the exact amount is by using the PIWIS Diagnostic tool.

DishoomX2

Thanks for the suggestion. I may have overlooked that bit of info. I added just over 1/2qt more and I'm now on the 2nd green bar from the bottom.

Sajan

Last month I drained 8.75 qts.
I measured it this time to give me an idea on how much to put back.

So I put back:
7.5 - said minimum reached
0.5 - 1 green bar
0.5 - 2 green bars
0.25 - 3 green bars

total = 8.75 qts. Next time if i drain the same amount, I will just start with 8 qts. I would rather be at 1 bar than 4. easier to add than take out.

TsaiCo

I just did a drain and fill, oil filter stay untouched, I filled with little bit over 8 quarts which shows 4 green bars after driving 5 miles.

6sigma

I did the same thing in my 991.2 T (drain/fill but did not change the filter). Filled with exactly 8 quarts and it now shows exactly full when hot.

TsaiCo

Would you happen to know How does the screen look like if it’s over filled? I have a 991.1 (should be the same .2’s hardware and software?) it does show bar in my, noticed other pictures on related post don’t have “bars”, nevertheless, overfilled or even under fill screen shot would be interested to understand

6sigma

Here is mine on 991.2 T. I don't know what it looks like if overfilled. It showed a little space under the full line for a few days after the oil change, but then moved up to full. I think it may have done that after a spirited drive where it got to 220+ temp.

I initially refiled with about 7.25 quarts of oil and the measurement said correct but was about a third of the way above min. I added the 3/4 qt to bring it to 8 qts total and it then went to just a little gray under full so i left it. It was after a few days and a spirited drive that it then showed exactly full.

acwild70

Stupid question but maybe not--- My first P car, bought last month, so excuse me I'm coming from 60"s GM muscle. I haven't changed my oil yet as it was just done but on the other cars I always filled the filter with oil prior to installing---- I'm assuming we do the same on the '12 991.1S

eagle1960

No. Unless you want to pour oil all over the place trying to put the filter in the housing.

acwild70

HAHAHAHA Shows my Ignorance on the set up LOL

iWrenchmy911

folks, the indicator on the cluster is simply that - an indicator. There is no way to know exactly what your fill level is without a piwis. The indicator can tell you if you're under filled or over filled but that's it, everything else is just an approximation and is visualized on the cluster for peace of mind to the driver.

bkrantz

It would be like filling a conventional screw-on filter with oil, and then trying to screw it on when the open end faces down.