Dark expansion tank. Does this happen to Volvo's

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#21

06-24-2015, 12:11 PM

Moetheshmoe

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Quote:

Originally Posted by jagtoes

How good are your water hoses. If they are old they will deteriorate inside and shed black rubber that will stain the tank. Check for bulges and soft hoses and if you have sufficient mileage on them you might consider changing them.

That was my first thought but that little bit of oil floating on top made me wonder. Would rubber cause an oil slick?

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