So, today I started noticing that at idle, clouds of white smoke start coming out of the muffler, like enough to engulf the back of the car in smoke. but as soon as i start driving it goes away (and not just because the car is moving, but the smoking stops). any ideas whats going on? the engine was replaced 6k ago. how could i check if it's the head gasket and is there any other explanation? thanks for any info!
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