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The plug wires last a very long time. They also have a date of manufacture printed on them. The wires on my 98 V70 were replaced at 140K.
Caps and rotors? While there is no required time/mileage to replace them, they do wear. When I replaced the cap/rotor on my 98 at 140K, it looked like someone chewed on the end of the rotor. I would change the cap/rotor every other spark plug change - I guess that would be around 90K miles or slightly less.
Klaus
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Proud owner of a 220S. If I had more room, I would have more Volvos.
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