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I have a 2006 cobalt 2.4 and I have some milky white substance on my dipstick. I'm also getting a knock at idle but only after 15 mins of hwy. Is this most likely a head gasket in need of replacement?

The car sounds and runs normal at hwy speed and cold start up. I drive 15 mins to work every day and I live right off the hwy so my car sees mainly 70mph travel.

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Sounds like head gasket, (water in the oil).

Posted on Feb 09, 2015

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Sad786 is right as it seems to be water in the oil, so PLEASE DON"T DRIVE CAR. The water will ruin the motor and it will need a rebuild. Get the leak (gasket or crack) fixed and flush all the contaminated oil out before driving anymore.

Posted on Nov 13, 2014

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It is water mixing in oil, check if radiator has bubble and if it throws water when you start. If yes then its gasket if not than its cracks in any cylinder. hope its gasket...


regards
Asad

Posted on Nov 11, 2014

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This milky substance does not affect engine performance or any other functions of the vehicle. During cold weather, moisture contained in blow-by gases (exhaust , oil, fuel, water vapor) is cooled by the intermediate housing wall and condenses due to difference in temperature. A chemical reaction between the moisture reacts and the engine oil in the intermediate housing will yield the milky fluid. This fluid then eventually dissipates
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