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Dino oil would be called conventional oil, made from petroleum where synthetic is made from natural gas and synthetic oils will not break down and turn black like dino oil will.
I use synthetic in all my gas powered engines, I did try it in my motorhome with a diesel and they maintance light for oil change came on within a 1000 miles so i drained it out and went back to rotella 15w40 and change oil around 6000 miles.
Your maintance light probably came on because you reached the mile interval the factory set it at, or it didnt get reset on last oil change,your owners manual should tell you how to reset the oil change light
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