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  1. YF (2011-2014) Sonata/i45
    Just changed the ATF fluid at 99k miles. Used valvoline maxlife red fluid. $7/qt. Mechanic used up all 5qts. Drain plug had some material glob up, but not much. Fluid came out mostly reddish. I think it was fairly clean due to the drain dealership did at 60k due to a transmission sensor fail...
  2. AD (2017+) Elantra
    What is the best cold weather fluid for a 2017 Elantra SE? Mine has started hard shifting in cold weather...until the car warms up, then it shifts perfectly. I took it to the dealership and they said this is normal Hyundai transmission shifting in cold weather. So I asked Hyundai directly and...