
Remove the left secondary camshaft drive chain tensionerbolts.Remove the left secondary camshaft drive chaintensioner.

Remove and discard the left secondary camshaft drive chaintensioner gasket.Inspect the left secondary camshaft drive chain tensionermounting surface on the left cylinder head for burrs or any defectsthat would degrade the sealing of the NEW left secondary camshaftdrive chain tensioner gasket.
Secondary Camshaft Drive Chain Shoe Removal - Left Side Valvetrain Camshaft
Oil Level Indicator and Tube Removal Engine Lubrication Oil Level Indicator TubeGM Oil Life System Resetting
When the system has calculated that oil life has beendiminished, it will indicate that an oil change is necessary. ACHANGE ENGINE OIL light will come on. Change the engine oil as soonas possible within the next 1-000-km(600-miles). It is possible that, if driving under thebest conditions, the oil li ...