What type of oil should be used for 2006 Hyundia Sonata

well the best is 5w-40 somthing like mobil rally formula or eql...

It will tell you in the owners manual.

I believe the recommended oil is 5W-30

hundai reccomends 5w-20 but there are several options depending on the heat range in the area you live in. the owners manual will tell you what the acceptable ranges are

10w30w i would suggest Quaker State,or Valvoline.

10w30 should be fine unless your car has excessive mileage, strts to use oil between oil changes, etc. go to higher viscosity oil or additives.

5w-30 is what i use in mine, and what ever is on sale if your doing it yourself because now a days their basically the same (name brand wise)

use what mfg and whats on oil cap that's why it said 5/20

Living in Canada I use the recommended 5/20. When it drops below 0C I will switch over to 5W30.

owners manual to old to be considered, stupid answer

Project Farm is an excellent independant website for you to judge oil. Very comprehensive. Amsoil Signature is the best you will find for extended interval and best performance. I have used Amsoil for years, since 1980. My Jetta 4 cyl gas engine had 400,000+ km (248,500+ mi) before being totalled out in an accident. Engine still ran great; body parts were too expensive to fix. Have also used Redline; excellent oil too. Note that both Amazon oil and Super Tech (Walmart) have very good ratings and are very inexpensive. May be the same oil, both are made by Warren Products. Again see the Project Farm video comparing Amsoil Signature against Pennzoil UltraPlatinum to see a comprehensive summary of many brands oils. The tests mimic the SAE oil tests but I don't see a test to see how each oil holds deposits in suspension in the oil, so they don't form in the engine.