I could use the bmw block sense he can tap all the holes to 12mmx1.5 but something tells me that particular shape wont fit. I am, however, interested in c280nz's idea. I am glad to see mercedes has that auxilary plug becuase i have looked over the junk block i have and theres only a coolant drain/auxilary bolt. I would like to know the thread size on that piece so i can begin messing with it.
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