Chevron Supreme conventional's excellent oil. I used either it or its corporate companion product, Havoline conventional, in the 10W-30 flavor in my Hyundai V6 over the past 3+ years I've owned the car. No regrets. The one exception was my previous oil change - found several bottles and partial bottles of various brands dating all the way back to SH, dumped 'em in, and screwed on a SuperTech oil filter. Even that UOA came out fine...