Originally Posted By: nickolas84
You do have Dexos 2, only it is specked for diesel engines.
One last thing. Is it possible the oil service interval calculator be set up differently? Mine usually calls for an oil change at ~2 years/18.000 miles, though I find most GM owners on BITOG to report getting 5-10 thousand miles calls for an oil change.
Your OLM would be calibrated for your particular vehicle, engine, and country / climate of operation. You cannot compare it to vehicles being driven in North America due to different fuel quality, driving habits, regulations, etc.
That being said, if your engine is a D.I. model, then you may be better served by staying with a Dexos 2 oil vs a Dexos 1 oil to minimize valve deposists.