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Don't worry; this is straight from the Bentley Manual

(Thanks Steve)

Hydraulic Cam Followers (M50/M60 Engines)

The M50 and M60 engines use self-adjusting hydraulic cam followers
to keep the valve clearances within a limited working range. The
Cam followers are sealed units and require no maintenance or
adjustment but be sure to inspect the cam follower bores for wear
or scoring.

Under some circumstances, such as a cold start, the cam followers may become noisy.
Hydraulic cam follower noise is usually a high-pitched tapping or chattering noise.
In most instances, this is considered normal as long as the noise goes away in a few
minutes (Maximum 20). If the noise dose not go away, either the follower is faulty or the
oil pressure to the follower is low.


And there ya go ! Nothing to worry about….
 

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good info silverBMW528
 
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