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    Feb 9, 2008 4:48:10 AM

    dkreidel
    Co-Pilot
    dkreidel
    Loc: SoCal USA , United States
    Posts: 167, Gallery
    Registered on: Jan 10, 2006

    Oil consumption question

    I now have 1,500 miles on my 2008 TT, and the oil level has not dropped even one segment yet. I have driven it fairly hard during break-in, at speeds up to 150 mph. My 2006 C2S burned a qt in the first 1,000 miles, then stabilized. It seems my turbo is not burning any oil, or the oil level measuring system is tango uniform. What are other people's experiences?

    Dick

    Feb 9, 2008 5:13:00 AM

    AK997TT
    Junior
    AK997TT
    Loc: SoCal
    Posts: 76, Gallery
    Registered on: Sep 22, 2006
    Reply to: dkreidel

    Re: Oil consumption question

    I just added a half quart to mine at 2400 miles.

    Feb 9, 2008 5:34:41 AM

    Over the Hill
    Pilot
    Over the Hill
    Loc: Bellevue, Washington, USA
    Posts: 386, Gallery
    Registered on: Aug 16, 2006
    Reply to: dkreidel

    Re: Oil consumption question

    Dick, You're not driving it hard enough!

    Feb 9, 2008 5:41:57 AM

    AAHTT
    Senior
    AAHTT
    Loc: san diego
    Posts: 564, Gallery
    Registered on: Jan 21, 2006
    Reply to: Over the Hill

    Re: Oil consumption question

    Quote:
    Over the Hill said:
    Dick, You're not driving it hard enough!



    you beat me to it.
    Dick, I have averaged 1 quart/2500 miles over the last 23k miles. consumption was higher early on, then decreased significantly.

    Feb 9, 2008 5:56:03 AM

    edz
    Rennteam Pro
    edz
    Loc: South Orange County
    Posts: 2021, Gallery
    Registered on: Oct 11, 2005
    Reply to: AAHTT

    Re: Oil consumption question

    Mine just turned 1000 miles and I have not added anything yet, it came down one bar and since the car is 6 months old and was already at the shop for the exhaust + plenum I had the oil service done too (yesterday). The harder your drive the more oil you will lose, that's the nature of dry sump engine

    Feb 9, 2008 6:21:40 AM

    MMD
    Rennteam VIP
    MMD
    Loc: usa
    Posts: 9652, Gallery
    Registered on: Dec 16, 2004
    Reply to: edz

    Re: Oil consumption question

    I've heard of lots of guys having the same "problem" of "zero" oil consumption. Makes me think an [expletive] at the dealer put too much oil in at delivery. Do our guages indicate when an engine is overfilled?

    I they do, then maybe there's excess oil in there but probably just short of triggering the guage to indicate overfilled.


    BTW, FWIW, I read a TSB which says you are allowed to burn up to 1.6 QUARTS per 622 miles. (one point six quarts per six hundered twenty two miles)!!!

    Feb 9, 2008 6:27:29 AM

    whyb2nd
    Newbie
    whyb2nd
    Loc: Albq.NM
    Posts: 42, Gallery
    Registered on: Jan 26, 2008
    Reply to: edz

    Re: Oil consumption question

    oil consumption in new turbo is based on seating the rings. the sooner you can run full boost you will see oil use reduce. obviously if you hammer the car alot you will use more oil then most, even after the rings seat/break in period.

    Feb 9, 2008 6:55:01 PM

    Alex_997TT
    Rennteam Master
    Alex_997TT
    Loc: Reading , United Kingdom
    Posts: 3320, Gallery
    Registered on: Nov 20, 2005
    Reply to: whyb2nd

    Re: Oil consumption question

    MY08 Turbo - almost zero oil consumption over first 2000 miles.

    MY05 Carrera S Cab - DRANK oil almost as fast as petrol!! Almost 1L every 1500 miles!

    Both using the same driver, driven the same way.

    Feb 9, 2008 7:01:57 PM

    964C2
    Expert
    964C2
    Loc: Dallas, TX , United States
    Posts: 1414, Gallery
    Registered on: May 11, 2004
    Reply to: Alex_997TT

    Re: Oil consumption question

    Don't forget...the engines are very different. The TT is a different crankcase and a "real" dry sump system.

    Feb 9, 2008 10:54:31 PM

    MMD
    Rennteam VIP
    MMD
    Loc: usa
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    Registered on: Dec 16, 2004
    Reply to: 964C2

    Re: Oil consumption question

    I wish I knew for sure instead of just guessing: it seems to me possible that many trips with lots of _cold_ _starts_ would burn significantly more oil than a few long trips. So it depends on _how_ you accumulate miles.

    Feb 11, 2008 9:00:22 PM

    Dan L
    Expert
    Dan L
    Loc: Santa Barbara, CA , United States
    Posts: 1955, Gallery
    Registered on: Jan 2, 2006
    Reply to: MMD

    Re: Oil consumption question

    It's a function of how they built your engine. I have seen many Porsche drivers reporting varying oil consumption in their various Porsches and assuming the driver is a constant, something's afoot. It's probably a problem with valve guides for those who use a lot of oil.

    Dan

    Feb 11, 2008 9:46:30 PM

    LoranTw
    Senior
    LoranTw
    Loc: Canada
    Posts: 569, Gallery
    Registered on: Apr 14, 2006
    Reply to: Dan L

    Re: Oil consumption question

    I have over 28,000 kilometers on mine and although I change my oil every 6-7000 kilometers I have needed to add very little. Nothing like my 993 C4S which used a quart every 1600 kilometers or so.

    Feb 11, 2008 9:53:08 PM

    MMD
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    MMD
    Loc: usa
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    Registered on: Dec 16, 2004
    Reply to: Dan L

    Re: Oil consumption question

    Quote:
    Dan L said:
    It's a function of how they built your engine.



    Interesting... . You mean like manufacturing variations?

    Like maybe Porsche has a 100 pistons hot off the machine tools.

    Then group them together in sets of six where each unit is closest to each other unit in the set and all within tolerance. Those go in the same engine.

    Another set of six is _different_, but since they are "mated with matching pistons THEY go in the same but different engine.

    If you took six pistons at random that were within tolerance but not _matched_ to each other maybe THAT would probably be a bad engine.

    So something like this this "matching" of sets could explain the oil consumption differences in perfectly good engines.

    Again, just my amateur guess. (no time to fact find).

    Anybody know? Why is there suuuuuch a huge range of oil consumption rates in otherwise perfectly good engines?

    Why would Porsche tolerate an obscene amount of oil to be burned (up to 1.6 liters per 1000km)?


    Oh, could be any parts, not just pistons.


    Feb 14, 2008 5:43:28 AM

    Dan L
    Expert
    Dan L
    Loc: Santa Barbara, CA , United States
    Posts: 1955, Gallery
    Registered on: Jan 2, 2006
    Reply to: MMD

    Re: Oil consumption question

    Take a look on the 997 forum in Rennlist and search for the oil consumption poll. Over 70% of the owners report little to no oil use,--period. There are only about 2 places where oil consumption can happen in an engine. (1) The cylinder walls against the piston rings and (2) the valve guides. For example, my cylinder walls were inspected with a borescope and found to be normal, but I consume a quart of oil every 1000 miles. This is by far the worst Porsche oil performance I have ever experienced,--and I have driven and broken in my engines the same way every time. I'm a constant,--the Porsche engine mechanic is not.

    Dan

    Feb 14, 2008 4:23:41 PM

    MMD
    Rennteam VIP
    MMD
    Loc: usa
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    Reply to: Dan L

    Re: Oil consumption question

    BTW, you guys have seen this TSB, right?

    Read bottom line (permissible max oil consumption) and be amazed.

    Feb 14, 2008 4:32:06 PM

    JoeRockhead
    Rennteam Master
    JoeRockhead
    Loc: Kathmandu , Nepal
    Posts: 4622, Gallery
    Registered on: Sep 17, 2007
    Reply to: MMD

    Re: Oil consumption question

    Quote:
    MMD said:
    BTW, you guys have seen this TSB, right?

    Read bottom line (permissible max oil consumption) and be amazed.



    Yeah, but that's for the two-stroke Porsche engines isn't it?

    Mar 5, 2008 8:23:29 PM

    Dan L
    Expert
    Dan L
    Loc: Santa Barbara, CA , United States
    Posts: 1955, Gallery
    Registered on: Jan 2, 2006
    Reply to: JoeRockhead

    Re: Oil consumption question

    Quote:
    JoeRockhead said:
    Quote:
    MMD said:
    BTW, you guys have seen this TSB, right?

    Read bottom line (permissible max oil consumption) and be amazed.



    Yeah, but that's for the two-stroke Porsche engines isn't it?



    Absolutely!

    Mar 5, 2008 11:41:34 PM

    MMD
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    MMD
    Loc: usa
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    Registered on: Dec 16, 2004
    Reply to: JoeRockhead

    Re: Oil consumption question

    Quote:
    JoeRockhead said:
    Quote:
    MMD said:
    BTW, you guys have seen this TSB, right?

    Read bottom line (permissible max oil consumption) and be amazed.



    Yeah, but that's for the two-stroke Porsche engines isn't it?



    Haha. Probably. Hummmm..., and I never thought to check if the Chevron gas I use had oil mixed in it.

    The other thing might have to do with definition of consumption:

    For Porsche's it includes the amount of oil leaked as well as the amount burned.

    Mar 6, 2008 1:59:44 AM

    PandaMan
    Senior
    PandaMan
    Loc: Canada , Vancouver
    Posts: 503, Gallery
    Registered on: Feb 1, 2006
    Reply to: MMD

    Re: Oil consumption question

    My turbo guzzles oil.
     
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