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Does it happen only when the engine is cold? If so it could be piston slap (which is normal). If it is the valves an oil change will not make any difference. These engines use solid lifters with shim-under-bucket adjustments (like a sport bike).

I thought I heard a similar noise about 2 weeks ago when the engine was cold. It went away once the engine warmed-up and has not come back.

Edmunds made a comment that there test vehicle made a "rat-tat-tat" noise that was common for a boxer engine (just like an old style VW or a 911)

I know these engines make different sounds from say, a chevy V-8. If the sound is consistently heard you could always run it by your dealer and have them take a listen.
 
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