NHTSA Complaint #10441175 — 2007 GMC SIERRA 1500

I OWN A 2007 GMC SIERRA 1500 CREW CAB. I HAVE SOME ISSUES WHEN I START MY TRUCK IN THE MORNINGS, I GET A TAPPING NOISE AS IF THERE ARE LIFTERS STUCK OR NOT GETTING SUFFICIENT OIL. I HAVE ALWAYS USED THE RECOMMENDED AC OIL FILTERS THAT I PURCHASE FROM THE LOCAL DEALERSHIP PARTS CENTER SO I KNOW THAT THE FILTER IS NOT THE PROBLEM. I AM A MECHANIC SO I KNOW WHAT AN ENGINE IS SUPPOSED TO SOUND LIKE. THE NOISE WILL CONTINUE UNTIL THE ENGINE WARMS UP WHICH IS APPROXIMATELY 10-15 MINUTES AND IS VERY ANNOYING. I AM CURRENTLY DEPLOYED TO KANDAHAR, AFGHANISTAN IN SUPPORT OF OPERATION ENDURING FREEDOM AND SCHEDULE TO RETURN TO THE US IN LATE MARCH 2012. I SPOKE TO MY WIFE TODAY AND SHE SAID THAT EVERY TIME SHE START THE VEHICLE FOR THE FIRST TIME THE NOISE IS THERE. I WOULD APPRECIATE IF YOU COULD ANSWER MY QUESTION CONCERNING THIS ISSUE. I LIKE THE TRUCK BUT THE ENGINE NOISE HAS TO GO. LIKE I SAID BEFORE I HAVE BEEN A MECHANIC FOR OVER 30 YEARS ON CONSTRUCTION EQUIPMENT AND AUTOMOTIVE EQUIPMENT FOR THE US ARMY. PLEASE DO NOT TRY TO GIVE ME A SHORT ANSWER TO TRY TO GET RID OF ME, I KNOW BETTER. THE CRANKCASE IS FULL OF OIL TO THE CORRECT LEVEL ON THE DIPSTICK AND I USE THE RECOMMENDED 5W30 OIL. WHY AM I HAVING THIS ISSUE? NOTE: I AM DEPLOYED SO PLEASE DON'T TRY TO CONTACT ME BY PHONE. *TR