Has anyone had a valve cover bolt strip out? Noticed a burning smell last night and saw a small amount of oil coming from the driver side valve cover. Went to check the bolts and one bolt was loose. I pulled the bolt out and it looks like the threads game way so the bolt came loose. It's the bolt right before the coil packs that is blocked by the coolant expansion tank. I replaced the valve cover and timing cover gaskets a little while back. No bolt tightening issues then. Any insight is appreciated. I've heard of helicoils but never used them. Thanks!

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Current Lineup

E36 318is
Turbo E36 M3
E39 M5
E70 X5 4.8i