Use manufacture recommended oil Wt. and rating (Conventional or syn.) Syn. oils allow for longer change intervals, but may not be recommend by manufacture to extend interval. So if it is still under warranty save some money and stay with the Manufacture recommendation conventional oil unless they specify Syn.oil.So as to not void warranty. If out of warrenty Syn. oils can have longer interval between oil change. Dose it effect or have any other real improvement in normal cars???? not really ...for the cos ..No. Is toilet water wetter then sink water?
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