15083 - SERVICE UPDATE. THIS BULLETIN PROVIDES A SERVICE PROCEDURE TO INSTALL AN ENGINE VALVE STEM OIL SEAL ON CERTAIN VEHICLES EQUIPPED WITH A 5.3L ENGINE (RPO L83). THESE VEHICLES WERE INADVERTENTLY BUILT WITHOUT AN ENGINE VALVE STEM OIL SEAL. THE EFFECT OF THE CONDITION IS THAT ENGINE OIL MAY SEEP INTO THE CYLINDER AND RESULT IN PRE-MATURE ENGINE WEAR. IF UNCORRECTED THE CONDITION OVER TIME COULD LEAD TO NON-COMPLIANCE TO EMISSIONS STANDARDS.
