For my commuter car I have a 06 sonata 2.4L with 163I miles car runs like new never had a problem with it I've used full syn for most of my oil changes but not im going back to Dino because I like a shorter oci my question is in the owners manual it says to use 5W20 in conditions 32 or below or all year it has 5W20 on the oil cap. But it says in the manual you can use either 5W30 or 10W30 in conditions above 32 if I remember correctly. So my question is what viscosity dino would you run for out 110+ degree summers