Do not add anything to the oil. The recommended oils meeting the dexos specification are all that is needed for good performance and engine protection.
Engine oil system flushes are not recommended and could cause engine damage not covered by the vehicle warranty.
Drive Belt Tensioner Replacement Pulleys and Belts Belt Tensioner
Drive Belt Tensioner ReplacementCalloutComponent NamePreliminary ProcedureRemove the drive belt. Refer toDrive Belt Replacement.1Drive Belt Tensioner FastenerCaution:Refer toFastener Caution.Note:Access the fastener through the hole in the framerail.Tighten45-Y(33-lb-ft)2Drive Belt Tensioner ...