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      07-12-2012, 10:42 PM   #60
Meeni
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Drives: BMW 330i 06
Join Date: Apr 2012
Location: TN

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You risk oil contamination by coolant, or coolant system contamination with oil (that may eventually clog your coolant passages). Also, the leak comes from the gasket deteriorating. Usually, it sends unhealthy amounts of particles to your water pump when it deteriorates into the coolant, and might participate to its death.

No relations to idle issues, everything is under pressure (oil and water) and does not communicate with the vacuum chambers.