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Well, I just joined the club. I snapped the inner bolt on the right side MM. Happened on reinstall. 1/4 drill and #2 easy out plus 1 center punch and 2 beers later....
I thinks those M8 x 40 bolts develope stress cracks. I broke mine just hand tigthening.
I think some of that stress could be caused by jacking on the crankcase. The mounts are designed to suspend the engine, not lift the car!