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  1. S38 Rebuild: VAC or OE?

    E34 M5 Discussion
    Hi all. My 91 M5 has been losing a LOT of coolant without any signs of internal or external leaks. Chris (bmwdirtracer) has helped me troubleshoot/diagnose the issue multiple times with leak down tests, pressure tests, etc and we still haven't been able to find anything. Previous owner had...