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Old 10-14-2016, 12:35 AM   #15
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OP, it's cool, is it gas or diesel? There's a sub forum for power trains/engine here, give us the brand of engine, how much oil you've added, miles, maintenance etc.... we'll help!

awesome thx..
2005 8.1 vortec, ive added 2.5 qts on a 150 mile trip

has new o2 sensors,new cats,passed smog.

i have no leaks and does not blow smoke at all.

wheres the oil going ?
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Old 10-14-2016, 12:41 AM   #16
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Have you checked that the amount of oil in the crankcase , agrees with the specified amount, from the engine owners manual , when the dipstick reads full .
This is called ; dipstick calibration ; and any engine gas or diesel , if the crankcase is over filled with oil, the crank will splash the oil onto the cylinder walls and the rings can't clean it all off, it goes out the tail pipe and can be hard to see.

EDIT : If the coach needed , O2 sensors and Cat converters , there's a good chance that they were damaged by the oil that the engine is loosing , there was a discussion about an 8.1l engine issue with intake gaskets that , caused them to use a lot of oil I'll see if I can track it down.

Here's the link to the oil consumption on 8.1 s due to intake gaskets and bolts.

http://www.irv2.com/forums/f22/intak...ine-95398.html

Further on the discussion goes from the 2001 engine on to include the 05. And other, instructions about oil consumption.
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Old 10-14-2016, 06:58 AM   #17
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Along with the intake gasket issue posted above, the PCV system is a known issue....
The PCV valve is integrated into the valve covers. Usually accompanied by low or rough idle speed.
Do you have a check engine light on? At minimum take it somewhere and have a diagnostic reader hooked to it, you should then be able to see crankcase pressure and engine vacuum
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Old 10-14-2016, 09:52 AM   #18
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fleetwood pacearrow excessive oil consumption
calmike4fun
You may be over filling the crankcase, (aka: putting in to much oil).
If I fill my 32 quart capacity crank case with more than 28 quarts of oil the oil level drops to the 28 quart level in a few thousand miles ...and then remains at that level for 6-8 thousand miles....(until I next change the oil).
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Old 10-14-2016, 08:59 PM   #19
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OP said "has new o2 sensors,new cats,passed smog."

I'm curious why you changed those items. When my MAF was dirty it caused O2 sensor check engine lights.

A couple dealers wanted to change my O2 sensors for $600. Another guy wanted to change the catalytic converters at $1,000 a piece. No way!

I changed an O2 sensor myself and it didn't help. Cleaning the MAF cured the problem.

That is excessive oil usage for sure. Don't know what the problem is.
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Old 10-14-2016, 09:17 PM   #20
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Have you checked your coolant for oil contamination?
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Old 10-15-2016, 02:30 AM   #21
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Have you checked your coolant for oil contamination?
No ...
But good call I will inspect

Thx you
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Old 10-15-2016, 02:37 AM   #22
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OP said "has new o2 sensors,new cats,passed smog."

I'm curious why you changed those items. When my MAF was dirty it caused O2 sensor check engine lights.

A couple dealers wanted to change my O2 sensors for $600. Another guy wanted to change the catalytic converters at $1,000 a piece. No way!

I changed an O2 sensor myself and it didn't help. Cleaning the MAF cured the problem.

That is excessive oil usage for sure. Don't know what the problem is.

Earlier in the month it was smog check time
Took to my normal place coach didn't pass
Told bad o2

Replaced re tested again failed

Took back to my mech checked out and ran his own diiognostics and determined we needed cats .

Finally passed smog
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Old 10-15-2016, 02:42 AM   #23
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After draining the oil I've added the require amount 6.3 qts and after a short trip in down on oil with trip indicator reading low oil level. I have no signs of leaks nor blowing smoke
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Old 10-15-2016, 07:22 AM   #24
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Which oil filter are you using? I believe the standard filter is a 1/2 quart. You can move up to a full quart sized filter. There may also be a quart and a half filter.
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Old 10-15-2016, 10:20 AM   #25
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I use a PF454 filter and fill with 7 quarts of synthetic. To get it exactly right I was adding 6 3/4 quarts but for the past couple years I've been using the entire 7 quarts.

Historically I'll have to add a half quart of oil after about 2,000 miles.

I never use after market filters and buy mine at the Chevrolet dealer here in town.
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Old 10-15-2016, 10:39 AM   #26
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LOL!

This is like going to the doctor and telling him, "I don't feel good." and expecting him to cure you.

Amazing...
My son once told me "Daddy, a part of me hurts." Of course he was 4 at the time.
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Old 10-15-2016, 12:19 PM   #27
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That much oil usage should be easy to find, if no external leaks, then I would suggest removing spark plugs and seeing if wet with oil, if all plug wet, then it's a internal vacuum leak, like PCV or intake gasket, if only one then issue with that cylinder....
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Old 10-15-2016, 04:08 PM   #28
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Remember that catalysts "eat up" hydrocarbons. This means that they can cover up oil consumption by eating the smoke that is produced by an engine that "Burns" oil.

You might want to try this:

Disconnect the exhaust pipe before the catalyst and run the engine. See if any grey/blue smoke comes out. If it does, follow standard diagnostics for oil consumption.
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