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I put UV dye in the coolant tank, and continue driving the vehicle. One day I drive about 20miles to gas station. When I park the car, a lot of coolant went off in left front of the car. Later I put a gallon of distilled water in, and drove it back home. The next morning I jack up the car, remove the bottom plate. Surprised to find out only the radiator drain plug have the dye color on it. So I removed the radiator plug, did a search online, found that the radiator plug they put in was the short version. My car is auto-transmission, so the radiator plug should be a long version. Last year the car repair shop changed my radiator, apparently they put the wrong radiator plug in it, and caused me a whole year of mysteries coolant leaks. I went to a local BMW dealer and got a long version of radiator drain plugs for $15. And I did not have leaks since then.
Lesson learned, don't go to some store who don't know what they are doing....
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