Unleash the Beast Within Optimize with Black Coolant

My coolant (which was red not too long ago), has suddenly turned black. The level hasn't changed, it's still just up to the fill line, but it's got me worried. The coolant reservoir isn't just an overflow like most cars. It's actually pressurized so potentially the black plastic is easier to make in the ... When I went to drain the Evans out of the radiator, it came out black. I thought it was oil at first! I double checked and it wasn't oil, but I can't help but ... I would try a little dishwasher soap (low suds) for a flush. Any time I have seen black it was from either a combustion leak or a oil cooler ... Cross contamination from the combustion chambers. Mix carbon etc. with antifreeze and you get oily gel. Normal sediments from the cooling system ... I've got black sludge in my coolant. It does not appear to be oil. It was thick on the cap, almost like a paste, and dipping a rag into the radiator, it came ... BobPell ... Probably debris, minerals and what ever that built up in the system finally released. Also the interior of your hoses may be starting ... “Black coolant” is corrosive. It has been observed in some engines that have failed, but most reports of black coolant are from engines in service. In general, black coolant may be caused by a few issues. There are different ways to diagnose each of the mentioned causes. X1 Eco also contains advanced metal corrosion inhibitors specially formulated to protect your water cooling equipment from corrosion and scale build up, prolonging your equipment life and thermal cooling efficiency.