They use it and Hyundai requires it are 2 different things. However my understanding from posts here 0w20 is always "synthetic" (correct me if I'm wrong). So if Hyundai is stamping 0w20 on their oil caps now then that can be why?
07 Acura TL Type S 6MT-PU 5w30/Bosch 3323
07 Acura RDX-PP 5w30/Bosch 3323
96 Honda Accord-PYB 5w30/Bosch 3312
01 Nissan Maxima SE-QSUD 5w30/WIX 51356