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I had a small, slow antifreeze leak on my well maintained 1987 745T. When I changed to the orange stuff, the leak showed right up. One of the water tubes on the turbo was not sealing against the copper washer, and there was an orange crusty deposit to identify the leak. The problem was with the sealing surface of the banjo fitting. One side was not flat and no washer would make it seal. I simply flat filed the deformed side of the banjo fitting, and the car has not needed any coolant added in two years.
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