+ 2006 Sierra 2500HD 4WD 6.6L Duramax15W-40 Synthetic Heavy Duty Diesel Oil
Signature Series Fuel-Efficient Synthetic Auto Tranny Fluid
Severe Gear 75W-90 Synthetic EP - front & rear differentials
Slip Lock Gear Oil Additive - front & rear differentials
Signature Series Multi-Vehicle Synthetic ATF - 4WD transfer case