Burning Oil

#41

On 09/15/2009 06:02 PM, Gordon McGrew wrote:

Quote:

On Mon, 14 Sep 2009 20:07:14 -0700, jim beam<me (AT) privacy (DOT) net> wrote:

On 09/14/2009 07:30 PM, Elle wrote:
cf... (AT) FreeNet (DOT) Carleton.CA (M.A. Stewart) wrote:
Since you have resigned yourself to possibly replacing the motor in
the distant future, try experimenting with heavier oils (20W50, 20W40,
10W40).

Yes I think this is definitely worth experimenting with a little. I
will probably give the Mobil 1 a chance for another six months, then
try a heavier oil.

Looks like you have nothing to lose. 1200 miles per quart isn't
great, but its not that bad. At least it isn't 500 miles per quart. Try a
20W50 oil for 2000 miles and see if the oil consumption is reduced. Try
what the other person said, which was a 10W30 oil and the additive
called "CD-2".

I will research the CD-2, thanks.

stay away from that stuff. it cokes up engines something chronic. it's
just a short term fix designed to shift junk off a sellers driveway.

I agree. Just use the highest viscosity the manual recommends for
your temp range and keep a few bottles in the trunk. Just keep
checking it once a week and add as needed. I actually think 1200 miles
per qt is fine for a car with 190,000 miles. If it doesn't make it to
a quarter million, it won't be because of this oil burning problem
(unless you run it dry).

mine was burning at that rate, but has since dropped to one quart per 4
or 5k.

#42

On 09/15/2009 06:58 AM, C. E. White wrote:

Quote:

"jim beam"<me (AT) privacy (DOT) net> wrote in message
news:ba6dnexjW938CTLXnZ2dnUVZ_rOdnZ2d (AT) speakeasy (DOT) net...
On 09/15/2009 03:53 AM, Elle wrote:
On Sep 14, 9:04?pm, jim beam<m... (AT) privacy (DOT) net> wrote:
?even if the
valve guides are chronically worn, if the seals are sealing,
there's no
oil loss.

A lot of auto maintenance sites (not just random people posting)
state
that either the valve stem seals or the valve guides may be
failing.

1. your honda valve guides are not submerged.

It doesn't matter. Oil is being flung all over the inside of the valve
cover. If your guides are worn and your seals are worn, oil will be
sucked in through the intake guides.

it does matter - submerged guides can leak literally pints.

Quote:

2. it's been known for internet "experts" to be full of it.

True

3. i've experimented with /no/ seals - you lose a little, but it's
not a massive source of loss.

True as well. I've had engines that did not even use valve stem seals
(Jensen-Healey 2.0L Lotus 4 cylinder) and others that only used them
on the intake valves. However, when you say "you use a little," that
might add up to a lot in the eyes of some people. For a new engine
with minimal valve stem to valve guide clearance, the loss will be
small. However, for an older engine with worn stems and guides, the
loss can be significant. In the old days this was still trivial in
many cases. However, with modern engines, severely worn guides can
casue several problems - excessive air leakage will screw up the PCM's
calculation for fuel delivery and excessive oil consumption can damage
a catalytic converter.

right, but that's a whole different issue.

Quote:

I
understand what you're saying but it is hard for me to say from the
Civic shop manual drawing whether a new, properly installed valve
stem
seal alone will ensure no leakage in this area.

unless it's lost flexibility, is worn or cracked, it will.

New seals will help, but becasue of the excessive play, they won't
last as long, and they will still let more oil past than seals on
unworn guides and stems.

but they are literally weeks old - no "lasting" problem.

Quote:

Seals have to allow some oil past to keep the
valve stems and guides lubricated, so they aren't perfect seals by
design.

untrue - the stems and guides run dry. the seal is there to do just
that - seal.

Quote:

Regardless, for now I am going the route of trying to clean things
up
with continued use of Mobil 1 and/or maybe Auto-RX.

If the engine is only using a half a quart per 600 miles, I'd just
drive it. With 197,000 miles on the engine, it is not just the valve
train that is worn.

a honda should be up there at at least 300k.

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Burning Oil

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Re: Burning Oil - 09-15-2009 , 11:28 PM

Re: Burning Oil - 09-15-2009 , 11:28 PM