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Old 06-30-2013, 12:34 PM   #21
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2013-06-30 (current)
4,400km (half according to MMI)

refilled 3/4 quart of 5w40 at 3,200km..

2013 audi q5 2.0t..

it's burning at a rate of 0.25 quart per 900km.
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Old 06-30-2013, 03:13 PM   #22
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Quote:
Originally Posted by pkalltheway2000 View Post
2013-06-30 (current)
4,400km (half according to MMI)

refilled 3/4 quart of 5w40 at 3,200km..

2013 audi q5 2.0t..

it's burning at a rate of 0.25 quart per 900km.
I have 3500 miles on my 2013 Q5 2.0T and MMI still shows full.
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Old 06-30-2013, 03:58 PM   #23
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Originally Posted by 123Audi4me View Post
I have 3500 miles on my 2013 Q5 2.0T and MMI still shows full.
that's the part i don't understand, how come some 2013 2.0t burn oil and some don't?

i find that the engine burns more oil if driving mostly in stop and go (city driving)....somehow i find it doesn't burn as much when driving long distance...

this is from my observation as i have just finished a 800km road trip in two days, it was at 3/4 full at all times...as soon as i came back and started driving in city for the past two days, it dropped a quart to half...
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Old 06-30-2013, 05:44 PM   #24
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Default Reasons, and things to check more:

The oil may not be getting burned in the old conventional sense of getting past the piston rings, or alternately past the valve stem seals. The rings would be the really worrisome ones since it requires a full engine tear down/replace. The stem seals are not insignificant, but are within the (removable) cylinder head. The classic checks for these are blue smoke out the exhaust on decent acceleration suggests rings (usually only seen on pretty tired motors), and blue smoke seen during long coast downs (like off a long down sloped highway offramp or down a long downward grade with foot off gas pedal) suggests valve stem seals. Both tend to tie to very high mileage or abused motors.

But rather than either of these, most likely what is happening is oil vapor is getting sucked through the PCV system and then burned in the engine. This is also an issue secondarily with the FSI motors since it later gets connected to fouled intake valves from the oil crud that gets deposited there and cooked onto the valves. Your hoped for fix/improvement to reduce oil consumption generally (if it persists) would be the basic PCV valve that regulates the vapor flow with vacuum, so the motor doesn't just suck too much in without giving the vapor a chance to settle back to regular (fluid) oil. The part name varies by motor some, but that's the conceptual component. You may want to search the archives more--whether here or in the even higher volume A4 boards with the 2.0T about it.

Finally, yes it does not surprise me you see it more in the city, and it's really a further sign excessive vapor is being pulled. Motors are at their highest vacuum at idle, during coast down and just off idle, at lowest under full acceleration, and at moderate levels cruising. Hence with lots of stop and go in town, the percentage of time the motor is running at high vacuum is much higher. In this case too, it's really motor run time that matters, not miles, so not nearly as many miles in town as on the highway per hour of run time translates to what you are seeing as more consumption per mile with renewed city driving.
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helpful cross reference to a C6 post with MMI and other TSB's that also cover D3 A8's.


Last edited by MP4.2+6.0; 06-30-2013 at 05:47 PM.
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Old 06-30-2013, 11:24 PM   #25
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Quote:
Originally Posted by pkalltheway2000 View Post
that's the part i don't understand, how come some 2013 2.0t burn oil and some don't?

i find that the engine burns more oil if driving mostly in stop and go (city driving)....somehow i find it doesn't burn as much when driving long distance...

this is from my observation as i have just finished a 800km road trip in two days, it was at 3/4 full at all times...as soon as i came back and started driving in city for the past two days, it dropped a quart to half...
I have been told by the dealer that the oil consumption is due to the use of low tension piston rings - the low tension rings are used to reduce friction and improve fuel efficiency. The design counts on the compression ring being pushed down into its seating by the high pressure gas within the cylinder to seal properly. If the engine is at low throttle, the seal becomes less effective, so there is more blow-by, resulting in more oil vapour being sucked out of the PCV. That's why the oil consumption issue is more pronounced in city driving, and it is less of an issue in Germany where they do a lot of autobahn driving. Basically if you drive the car harder, it will burn less oil.
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Old 07-01-2013, 04:15 AM   #26
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Originally Posted by 123Audi4me View Post
I have 3500 miles on my 2013 Q5 2.0T and MMI still shows full.
Same for me - at 4100 miles
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Old 07-01-2013, 05:00 AM   #27
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With 4,200 miles down about 15%-20%. The reading varies a bit now and then.
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Old 07-01-2013, 05:00 AM
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