No the threads don't strip the bolt sheers in two pieces. BMW had a the torque specs to high when the built the cars. They have since revised the torque specs for the bolts. The the bolts sheer, they saturate the gasket and it swells which damages it.
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--Marcelo
'06 Arctic Metallic 325i | Sport Package | 6MT | Dinan Stage III suspension | Dinan exhaust | 330i manifold swap! Click here! | Active Autowerke tune | 135i Brake Calipers | Deiselboost caliper brackets | E46 M3 front rotors
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