My wife owns a 1998 Infinity QX4 4x4 V6 and all oil changes are done by the dealer every 3 months or 3000 miles with out fail. Recently, the dealer stopped using QS 10w30 bulk, and changed to Mobil Dino 5w30 bulk. I know both are good oils for city/ highway driving. My question is which oil has the best benefits?
Thanks
Thanks