Your owner's manual will give an interval for maintenance. Spark plugs are durable, but I change mine more often than recommended. New spark plugs every three or four years (or 40-50K mi.) is not unreasonable to keep engine performance at optimal level. In 2005 I bought a 2001 Buick Regal that had 115K miles. It still had its original spark plugs, but they had become burned to the point that they were causing hesitation and misfiring. If you're changing them yourself, use some penetrating lubricant on them before even trying to turn them. New spark-plug wires, too? Absolutely (at 6-8yr or 100K mi. interval; definitely after 14 years).
At least take the plugs out to check for wear, contamination, electrode gap, and to make sure they are not seized in place. Use a proper spark plug socket with six flats, for maximum torque and reduced likelihood of damage. The rubber wires would be more likely to need changing after 14 years, with cold and wet winter weather approaching, than the spark plugs with 66k miles.
They're rated for 105,000 miles. But the longer they sit in the head, the more likely they'll seize. You should change them when they reach 80% to avoid misfires and damage to cat converter. I'd change them now for peace of mind. They're cheap compared to the cost of removing a seized plug later.
If it has a cast iron head then no worries you can change them if you want to. An aluminum head is more likely to have issues with seizing and stripping of threads. if it is running fine I would not worry about it for a while.
Yea, I think it's time, regardless of the mileage.
if they never needed changing then they would not sell replacements in auto shops
I recently bought a 2000 altima that never had its spark plugs changed or wires or anything, but the car only has 66k miles on it. Should I still change the plugs, wires etc? Thank you,
