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#14: 05-05-2013, 10:57 AM
 
 Caboobaroo
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If the coolant has brown gunk, it can also be the Subaru coolant conditioner, or stop leak in a Subaru bottle. If you have the head gaskets replaced with a multi layer steel instead of the single layer coated OEM gaskets, no need for the coolant conditioner as it'll eventually plug up your radiator and blow the head gaskets internally.

Seen a few cars that this has happened to.