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post #1 of 6 (permalink) Old 12-14-2012, 03:04 PM Thread Starter
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Burning Oil, Yellow Sludge, No Leaks

Hey all, I wanted to throw this out there since I've been reading up on the state of my car and can't narrow things down at all. I drive an '05 Cobalt, base model. The car has 140 000 on it in 7 or so years. Had it since the lot.

My oil light came on a month ago. I checked the oil and the dipstick was showing almost nothing. I added some oil, drove over to the mechanic and got a change. I was told to monitor the oil level and see if anything looked bad.

Today, just under a month after the change, I checked the oil levels and am showing only 3/4 bars of oil on the dipstick. On top of that, there was yellow condensation sludge on the tip. I've looked for hints to see if it's one thing or the other (coolant is good, oil colour is fine, exhaust seems normal...) and can't figure this out.

Im taking her in next week to have the plugs checked (bad news there and Im out a motor) and also getting a compression test done. Anyone have any related experience or any idea where the oil is going and what the cause is!?

---------- Post added at 03:04 PM ---------- Previous post was at 02:59 PM ----------

I should point out that I have looked for any leaks, as did my mechanic, and there aren't any.
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post #2 of 6 (permalink) Old 12-14-2012, 03:07 PM
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Do you do alot of short drives or does the car not warm up all the way most of the time? That yellow sludge is probably moisture. 10 minute drives are not good for a car.Also alot of ecotecs seem to burn oil because the valve cover gaskets allow oil to leak around the spark plugs, then it seeps through the threads and into the cylinders. My car burns .5L every 10,000km on synthetic but my brothers burns 1L in 5,000km

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Last edited by money_man; 12-14-2012 at 03:10 PM.
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post #3 of 6 (permalink) Old 12-14-2012, 03:28 PM
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Check the "PCV" system.

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post #4 of 6 (permalink) Old 12-14-2012, 03:35 PM Thread Starter
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Yes Money, short drives and it's cold where I am. I'm concerned though at how much oil goes so fast. I've only gone 1000km since the change.

Thanks Coby, I figured it might be something related. I'll know next week!
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post #5 of 6 (permalink) Old 12-14-2012, 04:06 PM
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Yeah sounds like a PVC system problem or the gaskets that money is talking about. Only other thing I can think of is bad rings, but you would have lower compression which would cause less power for you and a possible misfire.

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post #6 of 6 (permalink) Old 12-14-2012, 06:27 PM
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Pcv will make them "drink" oil if its messed up

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