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Last time I did the valve adjustment my mechanic upgraded the bolts and properly tightened it. So preventative or not, it's something you should take a look at every time the valve is adjusted, I suppose.
I was told that there really is no real "solution" to the VANOS tab issue, that even the fancy Dr VANOS "upgrade" is no guarantee that the tabs won't fail, and it is definitely one of those "keep a close eye" but replace when it breaks type when I suggested it to my mechanic.
Everyone has their different level of tolerances to risks I suppose.
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