How Much Oil Do you Use?

[Derek Pulvino]

Thanks for the info Bernie.  I'm going to have to take some time to digest 
that one, and implement a troubleshooting plan.  I think I've got somebody I 
can borrow a compression tester from.

And Alan, that's a good point, I really don't know how much longer I'll have 
the car, but I also want to think about the lifecycle of the car itself, in 
so much as I don't pass on a "doomed to die soon" car to the next user.  At 
this point, I don't see another car mortage in my near future, so it may be 
another 100k that the 200's sticks around for!

Derek P

> > From: "Derek Pulvino" <dbpulvino at hotmail.com>
> > Date: Fri, 16 Jan 2004 10:05:58 -0800
> > To: jmajau at balt.net
> > Cc: 200q20v at audifans.com
> > Subject: Re: How Much Oil Do you Use?
> >
> > May be a bit exagerated,  I don't see any oil burning residue on the 
>rear
> > bumper of the car.
> >
> > I don't feel like reworking the equation, but roughly 250k miles to come 
>out
> > even from this "burn rate" if I add 02 sensor costs every 50k miles.
> >
> > Hmm, now we're at total mileage on the car of 450k...maybe a little 
>beyond
> > the life expectancy?  Still doesn't balance out.
> >
> > But still didn't answer the question, why is this happening.  What are
> > potential culprits?  How can I be sure it's the head, and not turbo 
>seals,
> > or a problem with the crankcase vent system?  I figure leak down will 
>tell
> > me block vs. head, but how could I tell about the turbo seals or if the
> > cranckcase vent system is my culprit?
>There are no common, contact type, elestrometeric rotary shaft seals, just
>labyrinth seals across which there is positive gas pressure to the return
>oil passages.  Bearing wear causes seal clearance wear with resultant oil
>blow by.  If the turbo to IC and the IC to IM hoses are heavily oil wetted
>you have either a piston blowby problem coming thru the crankcase breather
>system to the turbo fresh air input (the compressor wheel should be oil
>coated), or the turbo bearings are shot, (the compressor wheel not oil
>coated).
>
>Do a compression check, first dry and second with oil injected into the
>cylinder to better seal any ring leakage.  If no dif, you have a valve
>problem.  Incresesd comp points to a ring problem.
>
>Tis good to isolate the source of your problem, such that it is easier
>monitored, but DFI if IAB!
>
>Bernie
>
>2

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