Oil consumption - how much
07-29-2010, 04:53 PM
#76
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GreenPDK--
GreenPDK--
I don't think it has anything to do with build date. Mine went through 3 qrts of oil the first 2400 miles, then maybe another quart for the next two 1000 mile intervals. But now, at 6800 miles, no loss of oil for nearly 2000 miles and counting...
I also have a green C2S pdk launch car, 07/08 early build.
GreenPDK--
I don't think it has anything to do with build date. Mine went through 3 qrts of oil the first 2400 miles, then maybe another quart for the next two 1000 mile intervals. But now, at 6800 miles, no loss of oil for nearly 2000 miles and counting...
I also have a green C2S pdk launch car, 07/08 early build.
07-29-2010, 05:04 PM
#77
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Ronnie-I can totally appreciate your position. I doubt that anyone adding a quart every 8 or 9 days would want to stick with their car. The reality is that most of us that are burning oil are not doing so to that degree. It is agreed that these engines will all burn some oil.
The issue (again) is why some of us burn large quantities and most will burn very little. I find it very curious that the reaction from Porsche is just to say that there is no problem with no explanation. How can they put in the manual that is ok to burn up to 1.6 qrts every 600 miles when most 997's (when broken in) don't burn any after thousands of miles. I can't be sure but it seems like Porsche knows or should know what is going on. Their reluctance to disclose anything must be because they believe by doing so, a financial liability may be created.
If I was aware of this issue when I payed 100k for my car, I would have tried to work something into the deal that protected me. I believe that everyone purchasing these cars would love to avoid an oil burner.
The issue (again) is why some of us burn large quantities and most will burn very little. I find it very curious that the reaction from Porsche is just to say that there is no problem with no explanation. How can they put in the manual that is ok to burn up to 1.6 qrts every 600 miles when most 997's (when broken in) don't burn any after thousands of miles. I can't be sure but it seems like Porsche knows or should know what is going on. Their reluctance to disclose anything must be because they believe by doing so, a financial liability may be created.
If I was aware of this issue when I payed 100k for my car, I would have tried to work something into the deal that protected me. I believe that everyone purchasing these cars would love to avoid an oil burner.
Their response was basically..."that's the way it is."
07-29-2010, 05:34 PM
#78
Drifting
07-29-2010, 05:45 PM
#79
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GreenPDK--
GreenPDK--
I don't think it has anything to do with build date. Mine went through 3 qrts of oil the first 2400 miles, then maybe another quart for the next two 1000 mile intervals. But now, at 6800 miles, no loss of oil for nearly 2000 miles and counting...
I also have a green C2S pdk launch car, 07/08 early build.
GreenPDK--
I don't think it has anything to do with build date. Mine went through 3 qrts of oil the first 2400 miles, then maybe another quart for the next two 1000 mile intervals. But now, at 6800 miles, no loss of oil for nearly 2000 miles and counting...
I also have a green C2S pdk launch car, 07/08 early build.
Like I said before I don't think it's all cars with early build dates, just more than prior to the 997.2 cars.
07-30-2010, 04:54 PM
#80
Poseur
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I don't agree that 911 engines inherently use oil. This is my first Porsche that definitely requires you to check the oil level all the time. My others never used oil--including a turbo. This is definitely nuts.
07-30-2010, 05:16 PM
#81
Race Director
07-30-2010, 05:25 PM
#82
Poseur
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Your last paragraph is interesting, for one of the points that i brought up to the dealer and in mediation and arbritration is the idea that, since these cars can use an extraordinary amount of oil, the dealership should have informed me of this prior to me sighning my paperwork. Their response is that they do inform the owners of this via the owners manual. My response to that was that no one reads a 300 page owners manual (the oil conusmption amount is on page 288 of the 2009 manual) prior to signing their paperwork, in fact the owners manual is not given out until the paperwork is signed and the car is delivered.
Their response was basically..."that's the way it is."
Their response was basically..."that's the way it is."
08-18-2010, 12:03 AM
#83
Pro
Oil Consumption Update...
Here's an update...1,900 mi. post oil change,(16,900mi)...combined DD driving...just added 400ml to top off. Seems much less than what I first stated, but perhaps the engine is getting to where it needs to be. Plannning to change oil and filter evert 3k from now on. Had changed at 2500mi... 6,500mi...11,500mi and 15,000 mi.
08-18-2010, 12:41 AM
#84
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I think changing synthetic oil every 3K miles might be overkill.
It's not like these are turbo engines with oiling problems. Plus, I haven't heard of any 3.8 or 3.4 DFI engine failures at all .... (only some 2.9's)
It's not like these are turbo engines with oiling problems. Plus, I haven't heard of any 3.8 or 3.4 DFI engine failures at all .... (only some 2.9's)
08-19-2010, 08:12 AM
#85
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There are some other factors not being mentioned in this thread.
First, my guess is that whatever tolerances for oil consumption Porsche has calculated as design features and therefore normal, have little to do with cost and more to do with fuel economy. An engine with less internal friction will consume less fuel and car companies are under extreme pressure to improve their engines. Given that the DFI engines are impressive in this respect I assume that the engineers have aimed for a compromise point between bhp, friction, consumption, oil consumption. And the fact that the DFI cars manual has an increased nominal allowance for oil consumption compared to the previous generation reinforces my thoughts that it is a design feature where Porsche played on the limit with the tolerances to reduce friction and improve economy.
The second point is, that the oil we use nowdays, 0-40, is a very thin oil compared to what oils were used 5, 10 years ago. And it will find its way into the cylinders more easily especially when cars are driven in hot climates.
i find my 997.2 consumes more oil during the summer than during winter times as the oil runs hot at around 110-115 degrees when the car is driven hard.
First, my guess is that whatever tolerances for oil consumption Porsche has calculated as design features and therefore normal, have little to do with cost and more to do with fuel economy. An engine with less internal friction will consume less fuel and car companies are under extreme pressure to improve their engines. Given that the DFI engines are impressive in this respect I assume that the engineers have aimed for a compromise point between bhp, friction, consumption, oil consumption. And the fact that the DFI cars manual has an increased nominal allowance for oil consumption compared to the previous generation reinforces my thoughts that it is a design feature where Porsche played on the limit with the tolerances to reduce friction and improve economy.
The second point is, that the oil we use nowdays, 0-40, is a very thin oil compared to what oils were used 5, 10 years ago. And it will find its way into the cylinders more easily especially when cars are driven in hot climates.
i find my 997.2 consumes more oil during the summer than during winter times as the oil runs hot at around 110-115 degrees when the car is driven hard.
09-11-2010, 05:10 AM
#87
Drifting
So I topped off again on the 3.6l 997.2 DFI engine as my oil level hit the warning line.
Consumption figures seem to be improving.
Last topping off I got about 1000miles per quart. This top off I got about 1400miles per quart.
I did have a good couple of longer road trips in this last cycle rather than just the 30-50 minute commutes and drives around the area.
Consumption figures seem to be improving.
Last topping off I got about 1000miles per quart. This top off I got about 1400miles per quart.
I did have a good couple of longer road trips in this last cycle rather than just the 30-50 minute commutes and drives around the area.
