Valve slap? Mine makes a little noise on colder mornings (note that cold is relative in Bay Area, CA.) for a few seconds until the oil is pumping around.

Is the oil level good?

Assume you checked the other items mentioned.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)