Wow. this is the second oil change on my wifes new Hyundai Sonata LX V6. I chagned the oil at 500 and again just now at 1200. I will be going to regular 3k changes now. Thing is i really never sat down and read the manual until now. I use (hold your breath) Valvoline 5x-30 in it. SO i read the manual and notice these V6 motors recomend a wide range of viscocities. It recommends any thing from 5w-30 to 20w-50! Also only needs to be API SG or SH cert'd. WOW. Of course I used Valvoline Durablend 5w-30 this time with a napa gold filter. Cute little filters. Anyways, just thought i'd let everyone know how amaized I am at the wide range of weights if anyone cares.