At 93K I'm pretty sure that I still have my original plugs in the VX. I haven't changed them, and I bought the car with 35K on it. I am looking to replace the plugs soon so I went to my local NAPA to see if they had plugs for the VX. Their computer told them that the original equipment replacements for the VX (mine is a 2000) are NGK Laser Irridiums. At $15+ a piece they're a little spendy, but if I can get another 93K out of them then they're worth it.
The lady behind the counter did say that I should see a little better fuel economy after swapping in the new plugs. She also said the main difference between the high dollar plugs and the low dollar plugs is longevity and not really performance.
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