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At the risk of revealing my ignorance, if this were an emerging VANOS failure wouldn't I have at least one of the common codes or some performance (including noise) change? If I didn't see the fluid/gunk, I would have zero reason to think anything was in need of attention.
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'01 740i Sport; ‘06 Z4M Original owner, no mods
'14 Lotus Evora S; '13 Subaru BRZ, track & autox car
Sold/totalled: E46, E39, 2 E53s, 5 E70s, E31
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