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After 100k it’s very common for the valve cover to be brittle/cracked. If it’s not already cracked, it will either crack as its being removed or even more likely, crack while being torqued back down. For a part you want for another 100k, just go ahead and replace it and you’ll also replace the internal pcv valve.
Independent BMW shops will charge around $300-400 labor for it. I advice you replace the eccentric shaft sensor while it’s removed as well.
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