View Poll Results: How much oil do you add to your 997?
None. Never have to add any between oil changes
79
32.92%
1 quart every 5,000 miles
71
29.58%
1 quart every 2,500 miles
54
22.50%
1 quart every 1,000 miles
27
11.25%
1 quart every 500 miles
9
3.75%
Voters: 240. You may not vote on this poll
997 Oil Usage Poll
11-02-2007, 09:35 PM
#31
Rennlist Member
Quite the opposite for me...I'm actually pretty impressed with how many of these high-performance motors have required little to no added oil.
11-03-2007, 01:37 AM
#32
Three Wheelin'
Join Date: Dec 2002
Location: San Francisco Bay Area, CA
Posts: 1,485
Likes: 0
Received 1 Like
on
1 Post
Have a 997 C4S no oil use yet - how well does everyone trust the electronic oil gauge on these cars - dealer told me that they are not really accurate. If thats the case - how are you supposed to check it?
... I guess the trick is that we need to check the reading in a consistent manner. For example, every morning in the gargae when the temperature is about the same, the engine is cold, car is level, etc. This way, the digital guage reading is pretty accurate...
... The inaccurate cases will be if we check the oil sometimes when the engine is warm, sometimes when the car is park tilted (even a slight level), etc. The inconsistence will result in different readings.
As a result, I always check the oil when I first start the car in the morning inside my garage. This way I can have a consistent daily reference of how my oil consumption is.
Just my thought, other folks please feel free to correct me
With best regards,
11-03-2007, 05:41 AM
#33
Burning Brakes
Join Date: Dec 2005
Posts: 881
Likes: 0
Received 0 Likes
on
0 Posts
The idea of taking regular measurements in a consistent setting is good. However, I prefer taking the measurement at the end of the drive iinstead of at the beginning. My thinking is that because the oil has reached operating temp and viscosity, it will be a more accurate measurement. Also, just going through the measurement procedure gives the engine a minute or two to thermal-equalize while its idling before shutting it down.
I don't get the point of using gratuitous technology like this which is much more failure prone and inaccurate compared to a simple dipstick. Maybe Porsche thinks the Starbucks crowd can't be trusted with a dipstick, especially in the dry-sump cars.
I don't get the point of using gratuitous technology like this which is much more failure prone and inaccurate compared to a simple dipstick. Maybe Porsche thinks the Starbucks crowd can't be trusted with a dipstick, especially in the dry-sump cars.
11-03-2007, 12:52 PM
#34
However, I prefer taking the measurement at the end of the drive iinstead of at the beginning. My thinking is that because the oil has reached operating temp and viscosity, it will be a more accurate measurement. Also, just going through the measurement procedure gives the engine a minute or two to thermal-equalize while its idling before shutting it down. At the end of "the drive"? This requires, what 20-30 mins to cycle? Here's but one of several threads on oil useage
https://rennlist.com/forums/997-forum/222078-oil-consumption.html
Also, Ben did a great bit on the inherent inaccuracy of these digital readout gauges that we have. Here "That’s an interesting point, the accuracy of the readout.
In any calibrated electronic gauge the readout accuracy is always half the increment interval. If the gauge is graduated to read out in whole integer increments the readout accuracy is ± 0.5. If it is showing exactly 1 on the display that reading is said to have an accuracy of 1 ± 0.5.
In the case of our electronic oil gauge, the increment interval is 0.4 liter, as this is what each segment on the display represents, and therefore the reading accuracy is ± 0.2.
If the actual oil level is exactly between two segments, say exactly between 0.4 and 0.8, that would make the oil level 0.6. And with a gauge accuracy of ± 0.2 it would flicker between 0.4 and 0.8, as in your case."
The above is in this thread https://rennlist.com/forums/showthre...ferrerid=36022
11-03-2007, 01:01 PM
#35
20,000 miles and haven't added even half a quart. Made one oil change.
11-03-2007, 08:07 PM
#37
No need for the attitude--OM relates fact that time to get reading will be delayed depending on engine temp and that the oil has to have flowed back into the oil pan. I didn't see any thing about thermal-equalizing--of course that doesn't mean there isn't something in the manual about it.
11-03-2007, 08:22 PM
#38
Racer
Thread Starter
Thanks All for your Responses - Keep 'em coming please!
This is great data - data that exists no-where else - thank you for your contributions. Let's shoot for 200 + responses!
11-13-2007, 09:28 AM
#41
Burning Brakes
Join Date: Mar 2006
Posts: 941
Likes: 0
Received 0 Likes
on
0 Posts
Very interesting thread. It would be nice to see if any of the ~35% that do not require any oil have anything in common such as year, model, break-in treatment etc. I had been toying with the idea of changing my C2 to an S, but now that I see that there is a 65% chance that my new car might need oil (vs. my C2 that doesn't) I might be content to stick to what I have.
11-14-2007, 04:00 PM
#42
Poseur
Rennlist Member
Rennlist Member
I propose that HOW you break it in has absolutely nothing to do with oil consumption. There are so many owners in this poll with as many ways to break in an engine that I believe the issue is something within the construct of the engines. If Porsche knew what the problem was they would solve it. They don't know, so this sort of oil consumption continues.
11-15-2007, 09:42 PM
#45
Poseur
Rennlist Member
Rennlist Member
I will get that spec and publish it herein.