ALL wheel/tire assemblies must have a RFV within spec beforebeing mounted on vehicle.
Important:If a wheel/tire assembly is not within the RFV specificationafter match mounting, the tire must be returned to the tiremanufacturer. DO NOT install tire/wheel assembly on a vehicle if itexceeds the RFV specification.
RFV is unrelated to tire balance.RFV is identifying the stiff portion of the tire anddetermining if it is within spec.If RFV is too high, it will result in a vibrationcondition.Do not attempt to measure RFV on tires that have temporaryflat spots. If necessary, drive the vehicle to relieve the flatspots.Prior to measuring for RFV, the tires must be inflated to thespecification on the label.Passenger Cars (including Crossover Vehicles) = 18lbs.Truck Tires: (P) - metric = 24 lbs.(LT) - metric = 35 lbs.
It is recommended that RFV measurements are made prior toinstallation of balance weights. Once adequate road force levelshave been achieved, move on to balance the assembly.Selecting the Right Engine Oil
(Diesel Engines)
Selecting the right engine oil
depends on both the proper oil
specification and viscosity grade:
Specification
Ask for and use engine oils that
meet the dexos2 specification.
Engine oils that have been
approved by GM as meeting the
dexos2 specification are marked
with the dexos2 approved ...