My wife's 2007 Sonata developed an irritating oil leak, noticed it while wife parked vehicle in garage during winter. Ordered a valve gasket kit and did the job last week. We're about ready to buy something new. Truth is wife's gotten bored with this car, window controls no longer working. Rust starting to break through several areas. But I'm a fan at how simple and trouble free this powertrain has been. I changed spark plugs once because I figured it was time. Other than that just oil changes and two transmission drain and fills. As an aside, if you change the valve cover gasket on these be careful with those old spark plug seal tubes. They get brittle, break when you remove cover and bits fall into the valve body. I had to carefully find and pluck them out bit by bit. I haven't kept track of oil changes for years on this. Full synthetic, 0w20 about once a year, usually just before winter. Vehicle gets tons of idling to warm up in the winter, and mostly short trips, her office is 10 minutes away. Has seen very little highway over the years. Me personally I would fix the small issues like window controls and rust and just keep driving till it says uncle. But wife says NAH! 
Next vehicle for her I'm thinking Mazda cx-5.
Next vehicle for her I'm thinking Mazda cx-5.
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