Holy Grail of conventional oils lol... there are so many good ones, and they are all pretty comparable in price and performance. Anything from a big name label will work great... Valvoline, Pennzoil, QS, Mobil 5000, Chevron Supreme/Havoline, etc etc. And yes most name brand conventional oils are actually blended with a bit of synthetic, which means Gp 2/3 blends since Gp 3 is considered synthetic nowadays.