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Hello,
Actually I just got my X6M back this morning from a low coolant issue. My light would come on and I would get a bad odor. I lifted off the plastic engine cover and could see the return had residue on the tubing. I believe it is a pressurized system due to the innercoolers. I was never actually low and I would advise against adding any as it is really easy to overfill. Turns out when I would get on it there was an internal crack inside the return that was covered up by the tubing. When they went to replace the tubing the return just fell apart...then they broke my water pump but that was due to inexperience by the tech. Anyway check your return line to see if you have any white residue on the tube.
Cheers
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