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A friend of mine, who is a BMW tech, flushed my intercooler. In BMW's infinite wisdom, the procedure was much more complex than it needed to be.
Front bumper came off (although I think you can do the flush without taking off the bumper) and I/C came off.
He used 2 liters of a "distilled water/cleaner" to flush the I/C. The amount of sludge that came out was surprising. The picture shows the result of the flush. We used seven gallons of distilled water to flush the system after use of the cleaner.
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