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: 558, 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
Veteran
964C2
Loc: Dallas, TX , United States
Posts: 1280, 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
Posts: 9652, Gallery
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
Rennteam VIP
MMD
Loc: usa
Posts: 9652, Gallery
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
Posts: 9652, Gallery
Registered on: Dec 16, 2004
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: Somewhere in , Canada
Posts: 3475, 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
Rennteam VIP
MMD
Loc: usa
Posts: 9652, Gallery
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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