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Oil/Oil Fliter-what do you use?

31K views 32 replies 14 participants last post by  chado skins  
I have had the same symptom of transmission downshifting using castrol high mileage. I'm relieved to hear that someone else has experienced this and found the problem to be in the motor oil, and not one of the more drastic things I've been contemplating. I decided to change to quaker, since thats what hyundai recommends, maybe the down-shifting will cease after 2 changes or so.
I find it interesting that quaker would cause more engine noise and be recommended by hyundai. If the noise was more prominent in winter, perhaps it was just the viscosity?