RW>What you have is a leaky lifter. If it sits for a while, the oil drains   
   RW>out of the lifter, probably due to the valve spring pressure. It shouldn't   
   RW>do that, but sometimes they do. If that 30 sec noise doesn't bother you,   
   RW>don't worry about it.   
      
   If you let the enging Idle until the noise stops it is really a don't   
   worry situation..   
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