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post #1 of Old 07-26-2010 Thread Starter
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Scum Floating on Coolant

Yesterday, when helping orient a friend to the the Volvo Penta 2003 diesel on his new-to-him boat, I noticed a layer (approximately 1/8") of tan scum atop the coolant in the expansion tank. There was no milkiness in the crankcase oil. Is the scum a cause for serious concern? What is it?
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