The online maintenance schedule for the 2006
lists these things to replace at 60K under "severe service":
* Air filter
* Fuel tank air filter (that's different than the fuel filter, and like the fuel filter, it seems to be another thing no one actually replaces)
BTW, here is the starting page
to find the online maintenance schedule. And here is the 2006 Sonata owner's manual in PDF form
There's a drain plug on the bottom of the AT. There is no normally-serviceable AT filter, so forget about dropping the pan. You'll get ~4.0 - 4.5 quarts out that way (assuming the ATF level is where it should be to begin with, of course). I can get just as much out using a fluid evacuator through the filler tube, so that's how I do it. If you remove the drain plug, you may want to replace the crush gasket. It takes 8.24 quarts (7.8L) of ATF in total.
I'm not going to get into the well-documented Hyundai ATF holy war, but I won't put SP-III in my car. AFAIC it's overpriced garbage. I use Valvoline MaxLife DEX/MERC
, which is synthetic and much cheaper. (Castrol has an ATF that works also, but it's not synthetic, and I have a synthetic fetish.) If you use a discount code
at Advance Auto Parts
, you can often get it for between $3 and $4 per quart. Whether this is a warranty issue depends on whether you have a warranty. If you're the second owner, the warranty is up at 5y/60K anyway.
These cars are coil-on-plug (CoP). You don't need to replace the spark plugs before 97.5K miles unless the car is exposed to extensive idling, long bouts of low-speed driving, trailer towing, or use of a camper or roof rack.