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I will add another to the replace a VC with an "OE" one only. Because BMW was so wise, and decided to use a plastic valve cover - they do tend to warp with heat over time so even if you replace the VCG the stupid cover won't seal properly if its warped.
My indy mechanic calls the non-OE versions "rockers" - because they can come "pre-warped" before installation even and if you're in there with everything apart, you don't want to come back and do it like the other poster above states.
It hurts, but better to do the job correctly once than incorrectly more than once!
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