excessive oil use

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Old 11 Sep 2005, 11:18 pm   #1 (permalink)
George
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Default excessive oil use

I have a 2000 corolla that is using about 1 quart per 1000 miles. No leaks,
definitely coming out the tailpipe, back bumper has residue above tailpipe
and tailpipe is black. Does not smoke on start up and I only see smoke when
accelerating hard. Cylinder compression is all with 5 psi of 185, plugs are
not fouled. 82,000 miles, regular oil changes. Is it possible for this
much consumption from valve stems seals, any other possibities other than
rings? I also have a 96 camry with over 200k that was maintained same way
with no oil use at all.



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Old 12 Sep 2005, 06:04 am   #2 (permalink)
Bob H
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Default Re: excessive oil use

PCV valve changed lately?

"George" <gpuzen@bellsouth.net> wrote in message
news:li7Ve.71$qA1.8@bignews6.bellsouth.net...
>I have a 2000 corolla that is using about 1 quart per 1000 miles. No
>leaks,
> definitely coming out the tailpipe, back bumper has residue above tailpipe
> and tailpipe is black. Does not smoke on start up and I only see smoke
> when
> accelerating hard. Cylinder compression is all with 5 psi of 185, plugs
> are
> not fouled. 82,000 miles, regular oil changes. Is it possible for this
> much consumption from valve stems seals, any other possibities other than
> rings? I also have a 96 camry with over 200k that was maintained same way
> with no oil use at all.
>
>
>



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Old 12 Sep 2005, 10:56 pm   #3 (permalink)
George
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Default Re: excessive oil use


"Bob H" <dontspam@nospam.org> wrote in message
news:H_ydnRJJBc0j_bjeRVn-hQ@adelphia.com...
> PCV valve changed lately?


Yes, it has a new PCV valve.


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Old 13 Sep 2005, 03:33 am   #4 (permalink)
Jason James
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Default Re: excessive oil use


"George" <gpuzen@bellsouth.net> wrote in message
news:li7Ve.71$qA1.8@bignews6.bellsouth.net...
> I have a 2000 corolla that is using about 1 quart per 1000 miles. No

leaks,
> definitely coming out the tailpipe, back bumper has residue above tailpipe
> and tailpipe is black. Does not smoke on start up and I only see smoke

when
> accelerating hard. Cylinder compression is all with 5 psi of 185, plugs

are
> not fouled. 82,000 miles, regular oil changes. Is it possible for this
> much consumption from valve stems seals, any other possibities other than
> rings? I also have a 96 camry with over 200k that was maintained same way
> with no oil use at all.


No smoke on start-up means stem-seals are OK. The smoke on accelerating
hard is due to extra heat burning oil-impregnated carbon in the combustion
chambers.

At a guess the piston-rings are "oil-pumping" due increased clearances in
their grooves. A move to an oil viscosity one grade up may make a
significant difference.

Jason


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Old 13 Sep 2005, 11:27 am   #5 (permalink)
Daniel
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Default Re: excessive oil use

Check auto-rx.com

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Old 13 Sep 2005, 11:41 am   #6 (permalink)
Daniel
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Default Re: excessive oil use

Check auto-rx.com

The idea is that piston rings can accumulate carbon and stick slightly
in the lands, thus failing to exercise sufficient tension against the
cylinder walls to control oil burning.
The oil control ring needs to leave a very light film of oil on the
cylinder wall to provide lubrication without leaving enough to burn
excessively.
With the engine turning at 2,500 rpm (for example), the pistons move up
and down a lot, so a very small difference in oil passing the rings can
show up noticeably.

I used the auto-rx product.
Not sure it made any difference as my engine was already clean, but it
will not cause harm and may well be of assistance in your case. (I
found it interesting that the development originated in effectively
cleaning ink from commercial printing presses)

I had, however, changed the oil much more frequently when first
acquiring the car, just to generally clean it out.
Later, when I pulled the oil pan to replace the seal, it was quite
clean inside.
Also, when checking valve adjustment and replacing cover gasket, the
valve area is clean.
There's quite a bit of heat in the combustion area, and conventional
oil can "break down" from heat, leave a residue of gritty carbon which
can accumulate around the rings, hence the original suggestion above -
plus if it helps, is much more cost effective than any engine work
involving disassembly.

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Old 13 Sep 2005, 01:05 pm   #7 (permalink)
George
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Default Re: excessive oil use


> PCV valve changed lately?


Dry compression 195, 190, 195, 200
Wet compression all were 220
New PCV valve, took off valve cover - clean as a whistle, no blockage in
hoses



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Old 13 Sep 2005, 09:01 pm   #8 (permalink)
Jason James
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Default Re: excessive oil use


"Daniel" <nospampls2002@yahoo.com> wrote in message
news:1126629671.050232.32450@g49g2000cwa.googlegro ups.com...
> Check auto-rx.com
>
> The idea is that piston rings can accumulate carbon and stick slightly
> in the lands, thus failing to exercise sufficient tension against the
> cylinder walls to control oil burning.


Sticking rings also cause a significant increase in piston "blow-by", as
well as oil-comsumption for the reasons you have posted.

To test for blow-by, allow the engine to come up to normal operating
temperature. At idle, the PCV valve does not allow too much crankcase
scavenging, as this would cause idle mixture problems, but even so during
this test, the PCV valve needs to be removed and the end of it covered with
sufficient rag to allow some airflow. Once this is done, the hole in the
cam-cover is plugged with rag, and the other vent hose running from the
cam-cover to the throttle-body is disconnected from the throttle-body. The
hole in the TB can be left open during this test. Start the engine and note
how much fumes are flowing out of the vent hose. These are all the blow-by
fumes the engine is generating. If you can see a continous flow with the
eye, then the rings are either worn or have lost tension or are stuck in the
piston grooves or worse may also be broken.

If the BB is hard to see, gun the motor to about 3000 revs for an instant
and look for any increase in BB. If it remains light,..then the rings are
OK.

As a compaison, a really stuffed engine will produce so much BB the smell is
unmistakeable. A sort of sweet oil-petrol smell.

Jason


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