As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALL DURING PREFLIGHT AND TAKE OFF AND CLIMB THRU FL350 AND DESCEND THRU FL 280 AND BELOW A STRONG OILY SMELL WAS PREDOMINANT INSIDE FLT DECK, SMELL DECREASED DURING CRUISE(<P>PERFORMED INSPECTION IAW 05-51-56. CONTAMINATION REMOVED FROM PACK AND PRECOOLER..</P> / <P> </P>)