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Re: Spark plugs
Platinum plugs are rated to last until 100K but I suggest changing them at 60K. Or, if you don't want to change them yet, just take them out, apply new anti-seize and wait until 100K. The reason why I always suggest changing at 60K is because I've heard of some people's plugs not coming out at 100K. Now, if you put new anti-seize on at 60K, you won't have that problem.
Yes, you can do it yourself. Go buy a Haynes/Chiltons manual for $15 and it'll walk you through it. On the 4th gen (I know you have a 5th gen), you just remove the engine cover, unplug and remove the coil packs then stick the new spark plugs in. Be sure to use anti-seize though.
There's a whole 60K tune-up that you should do; refer to your manual but what I'd suggest is:
Spark plugs
Fuel filter
Air filter
Clean throttle body
PCV valve
Coolant flush
Oil change
~THT
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