SailNet Community - View Single Post - Scum Floating on Coolant
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post #3 of Old 07-26-2010
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Could be rust from not changing the coolant, could be oil contamination from a bad head gasket or other source. If it is oily, it will settle out and leave an oil stain if you scoop some out and let it set. That would be a source for concern since a blown head gasket can really ruin your day. If you catch it early, it only hurts your wallet.
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