I have a 2006 Hyundai Sonata with the 3.3L V6. It has had 2 oil changes since new. the first one, with whatever-Hyundai-installed-during-assembly 5w-20, was changed at 3900 miles. the second, shell bulk 10w-30 was changed at 5000 miles (i wanted to get on 5K drains) the last oil was Shell bulk 5w-20. No consumption was noted at any time until wife took car to Florida and back, putting 2900 miles on it. It is now a 1/2 quart low. roads were interstate, at 70mph. I know a 1/2 quart isn't much, but I am a hater of any consumption at all. any one think maybe that 5w-20 is actually too thin for this engine? (it is what is called for, says in OM that 5w-30, 10w-30 can be used when 5w-20 is not available) or does this Shell bulk 5w-20 maybe not as shear-stable as it should be? I wanted to run 5w-30 all the time, but dealer does not stock that weight and has $14.95 oil changes and filter is cartridge type, not a spin-on, and retails alone for $12.95. So getting oil changed there is cheaper than I can do it. I have always run 5K intervals in all my cars without a problem. Just this slight consumption kinda worried me. Any comments or suggestions?