Someone had switched mine to regular coolant before I bought it. They failed to remove all the dexcool. I thought I had oil in my coolant due to LIM leak but that is the what the sludge looks like, it was collecting in the cap of the overflow tank. When the LIM was done switched back to dexcool. It has been flushed twice by me and once by a rad shop still have sludge showing up. The rad shop said good luck trying to get rid of it, no matter how good a flush and fill . IMO I wouldn't switch.
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What a great damn day, I can walk!
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