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thought I would share my experience with the HVA tick on the N52 engine
I have a late model N52, so I was puzzled why I would sometimes hear the ticking on cold starts, until oil temp would come up.
I realized it was tied to the oil interval. My valves were becoming really noisy on cold starts and the ticking would be there for almost 20 minutes (I used castrol 5w40)
switched to shell rotella t6 5w40 and the valve clatter on start up, HVA ticking was COMPLETELY GONE.
this is why I recommend to change oil every 5000 miles. if you are near this oil interval and are experiencing noisy valves on cold starts, now you know why.
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