Hyundai Repair: Routine maintenance for Hyundai Sonata, hyundai sonata, platinum plugs

Question
I've but 80,000 miles on my 2005 Sonata V6 with no problems.  I've kept the oil changed and tires rotated at reqular intervals.  Other than change the air filter I've had nothing else done.  I've bad about procrastinating.  I dread the bill I'll receive from my dealer service department if I have all my schedule recommends done. The timing belt and spark plugs were to be replaced at 60,000 miles.  How can I save and how serious is this?

Answer
If the timing belt strips or breaks, it will almost certainly cause serious engine damage.  If there were a way to tell exactly when this failure was going to occur, you could save money by waiting until just before that time.  Unfortunately, there is no way to tell, so you'll need to pick a time that best suits your own personal cost/risk ratio.  I've never seen a timing belt fail on this engine, and if my memory is correct, I haven't heard of it, so I have little reason to think you're facing impending failure.  By the same token, the belt is made of rubber and will not last forever, so we also know it'll fail at some point.  

As for the spark plugs, it's not necessary to replace them until you actually have a misfire, but at that point you need to replace them absolutely immediately.  If you continue driving the car while misfiring, you can damage your catalytic converters, which will be a very large expense.  I'd also recommend replacing the plug wires while replacing the plugs.  Once the plenum is removed to replace the plugs, the service facility should be willing to replace the plug wires for no additional labor charge.  If necessary to replace them at a later time, there will be significant labor involved in removing the plenum.  If you plan on keeping the car a long time, it's likely to cost you less money in the long run if you use quality platinum plugs and Hyundai wires to help ensure you don't need to do this maintenance again for a long time.