The manufactured recommended weight of oil for the 2004 Hyundai Sonata is 10w 40. For higher mileage engine it is recommended to use partial synthetic oils to help deal with the internal wear.
Take out the old one and put in the new one.
It takes 4 3/4 Qtts of Oil.
Hyundai sonata v6 holds 4.5 qts. with filter. Do not over fill.
My son has been trying to remove my 6-cylinder Hyundai Sonata for 4 hours. He just got it - you have to pull the motor mount and jack the engine. OR take it to your local mechanic and save yourself the hassle.
To adjust the timing on a Hyundai Sonata, you will need to use specialized timing tools. If you do not already own the tools, it may be a better option to take it to a certified Hyundai mechanic.
If you are afraid of breaking something take it to a garage.
Take it to a mechanic
It takes 5 quarts with a new oil filter.
in almost all vehicles since 1995 take 134A
4.5 quarts, and then check the dip stick.
I had the same problem on my '99 Hyundai Sonata GLS. It was the alternator. It costs about $170 and it's about $150 to take it to Car-X and have them install it.
four