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I have a question for all the 991.1 owners out there don't know if its different for the other generations... This March will be one year exactly since i got my 2013 991.1. I changed the oil as soon as i got and reset the interval using my icarsoft POR v3.0-
Here is my question:
My error screen says my oil change is due in 3 days or 6900 miles but i still have 2 more months to be a year (and just for information i have only put 2460 miles since i bought). You guys who have had your 991.1's for more than a year does your 911 do the same. Interval is earlier than needed per se?
And yes i change my oil either ever every year or 5k miles
Thanks
I have a question for all the 991.1 owners out there don't know if its different for the other generations... This March will be one year exactly since i got my 2013 991.1. I changed the oil as soon as i got and reset the interval using my icarsoft POR v3.0-
Here is my question:
My error screen says my oil change is due in 3 days or 6900 miles but i still have 2 more months to be a year (and just for information i have only put 2460 miles since i bought). You guys who have had your 991.1's for more than a year does your 911 do the same. Interval is earlier than needed per se?
And yes i change my oil either ever every year or 5k miles
Thanks
I believe you have to enter the date in ICARSOFT. I don't remember the format MM/DD/YYY or DD/MM/YY so if you did oil change on 03/01/2025 aka MM/DD/YYYY but entered DD/MM/YYYY or 01/03/2025 you would get an alert 2 months earlier. That would be my guess. I wouldn't worry about it your oil is fine.
There are three maintanance intervals, annual, intermediate (2 yr), and major (4yr). It may be the intermediate or the major service causing the reminder.
UOAs show time doesn't matter that much but oil can / will start to shear by 4K miles. Mobil One 0-40 that is Porsche recommended for the 9A1 motor definitely shears by that distance. Some of the designer oils (Driven DI40 for instance at 4 times the price) appear to last to 5K miles. I wouldn't go beyond that distance for any oil.
Note: Mobil One 0-40 has changed formulation many times. The oil now has less calcium to reduce LSPI for instance. So when it comes to oil evaluation (which oil is best) this is a fluid topic.
My 991.2 is a daily driver... so not quite apples to apples comparison but a data point nonetheless. I bought my C2S in May 2023 and I've done 3 oil changes - initial upon purchase, Feb 2024 and Feb 2025.
From the Feb 2024 report, Blackstone said to try going to 7k.... and I did. See results below. I plan on going another 2 or 3 months until the next oil change --- I'm currently about 3k from 45k.
Personally, I wouldn't worry about the time and wait out until the year is up (or longer).
My 991.2 is a daily driver... so not quite apples to apples comparison but a data point nonetheless. I bought my C2S in May 2023 and I've done 3 oil changes - initial upon purchase, Feb 2024 and Feb 2025.
From the Feb 2024 report, Blackstone said to try going to 7k.... and I did. See results below. I plan on going another 2 or 3 months until the next oil change --- I'm currently about 3k from 45k.
Personally, I wouldn't worry about the time and wait out until the year is up (or longer).
Your aluminum and iron are way too high IMHO. Your TBN is too low. Your viscosity is on the low end.
Blackstone will always compliment your values. But as far as I'm concerned you kept this oil for too long.
Thank you all for the insight- my only question was if the oil interval warning came on early as in before the year is up?
i did not want to start anything else haha..
Note- as far as the the other intervals 2 year and 4 year i did perform those as well but did not reset as the dates were well within spec as per the icarsoft diag tool (if i remember correctly i think they were in the 2027 or 2028 year's.. I will have to check just out of curisotity when i get my car back from the detailer tuesday or wednesday.
Still have the question why need to replace oil annually if you have not driven it much at all in a year... oil does not degrade nearly that time frame, especially recent synthetics -- speaking as an oil and gas chemical engineer. Definitely need to get it on the road and active... but sitting tight for a while with negligible miles, oil changes are not an issue.
If you are planning on storing a car for a time, fresh oil is goid since the TAN and TBN numbers are best (not acidic and thus will not harm the motor). Otherwise time isn't too important, especially as was pointed out ... with modern synthetic oil. As far as the original question, just reset the dash warnings and carry on ... keep a table of miles and times for all the various maintenance items for your car (column for item, column for date and miles last done, and a column for next due). The warnings on the dash simply put are meaningless.
If you want to track costs add a fourth column for that.
Still have the question why need to replace oil annually if you have not driven it much at all in a year... oil does not degrade nearly that time frame, especially recent synthetics -- speaking as an oil and gas chemical engineer. Definitely need to get it on the road and active... but sitting tight for a while with negligible miles, oil changes are not an issue.
When I asked this question of Porsche I was told modern synthetic oils can break down the fibers in the oil filters even when the car is not being driven. I kind of doubt that this will occur in a year's time but Porsche is always super conservative re maintenance (partly because it generates work for dealerships). Same with spark plugs. Most modern plugs will last a lot longer than Porsche indicates but the reasons for change have little to do with electrode wear but more to do with corrosion of the plug externally.
When I asked this question of Porsche I was told modern synthetic oils can break down the fibers in the oil filters even when the car is not being driven. I kind of doubt that this will occur in a year's time but Porsche is always super conservative re maintenance (partly because it generates work for dealerships). Same with spark plugs. Most modern plugs will last a lot longer than Porsche indicates but the reasons for change have little to do with electrode wear but more to do with corrosion of the plug externally.
Good point about spark plugs too... I do believe it is all about increasing shop throughput. Other car manufacturers, like my Acura MDX from even much older years have computers that tell me when to do maintenance (now have 180k miles on it and still fast and reliable as hell)... no need for a dumb "every annual" change requirement. Porsche money grab. Cannot blame them when customers follow (including myself just to clear the stupid alert).
Good point about spark plugs too... I do believe it is all about increasing shop throughput. Other car manufacturers, like my Acura MDX from even much older years have computers that tell me when to do maintenance (now have 180k miles on it and still fast and reliable as hell)... no need for a dumb "every annual" change requirement. Porsche money grab. Cannot blame them when customers follow (including myself just to clear the stupid alert).
Its Catch 22 because you need to do all scheduled maintenance to keep a warranty in force, and its very risky to own these cars without a warranty.
Still have the question why need to replace oil annually if you have not driven it much at all in a year... oil does not degrade nearly that time frame, especially recent synthetics -- speaking as an oil and gas chemical engineer. Definitely need to get it on the road and active... but sitting tight for a while with negligible miles, oil changes are not an issue.
I'm not an engineer but I have traveled on trains. I’ve put over 114,000 miles on my 2012.5 991 C2. Before I retired, it was my daily driver, and I changed the oil and filter every 5,000 miles without exception. These days I barely put 3,000 miles on it in a year, but I still drain the oil and replace the filter annually - I used to do it myself, but now I use an Indy Mechanic who charges just over $300 for this service. After more than 13 years, I’ve never once had to add oil for consumption. It’s an expensive precision machine; routine maintenance seems a reasonable bargain.
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Oil Interval Question
