Probably don't need to change them yet. I am not sure what the book says, but Toyota seems to use good plugs from what I have heard. If you are worried about it, pull a plug and check it out. If it is just a little darkened, then its fine. If it is oily, gooey, or charcoaled, think about replacing them.
your plugs should be changed every 30k
typical 30k svc here at the toyota dealer consists typically of the following: oil & filter change, air filter change, plugs, tranny and diff fluid change, tire rotation, coolant fluid drain and refill (use red toyota fluid) inspection of belts, hoses, and undercarriage, top off all other fluids and lube hinges........that is the usual 30k for most toys...............
just so you guys know, if you dont do anything to your 2.7 4x4 taco it runs fine until 120,000 miles, even through swamps, beat up farm land, wood, and mines. Then it runs like sxxx. This is also about the time your airbag light starts blinking, someone runs into you, you friend jackknifes a trailer into the bed, and your girlfriend or exgirlfriend keys your truck. Any advice on any of these things/
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