I was wondering what oil in the 5w30 grade was a low noack low shearing full syn. Ive used pp, valvo pu,qsud and Castrol syntec and carquest full syn. Ive used qsud the most and it seems very thin when I drain it. High smell of fuel also. The car calls for 5w20 0r 5w30 so I know if the oil shears down to a 20wt that's fine. I guess id have to do a uoa to truly know. Hyundai said the gamma di engine was hard on the oil and I should def change it by 4,000 miles.