Got the monthly update from Onstar stating that I should take the Terrain in for an oil change. Same update states that oil life is at about 50%. What's up? Do we believe the Oil Life Monitor or do we go back to the old idea that the oil should be changed every 3000 miles? If so, why go to the trouble of putting the monitor in the system in the first place?
I realize that when to change the oil is up to the owner but isn't GM recommending that we use the data from the owner's manual which states that the oil change should take place when the "Change Oil Soon" light comes on or every year, whichever is sooner?
I realize that when to change the oil is up to the owner but isn't GM recommending that we use the data from the owner's manual which states that the oil change should take place when the "Change Oil Soon" light comes on or every year, whichever is sooner?