A couple of years ago I found a broken bolt on the head, outside of the valve cover, behind the oil filter housing. Took it to the shop to be fixed and when they pulled off the valve cover, they found several more broken bolts in the timing chain area. They are not head bolts per se as they do not hold the head to the block. Rather they are for the timing chain cover. I wonder if one of those could migrate to the oil pan?
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