At 150k, I'd do it. Cheap insurance. Especially considering most plugs are rated at 100k. I changed mine at 91k and swapped in NGK Laser Iridiums (price was right at RockAuto), and there was an immediate improvement in smoothness. My #4 plug was the only plug showing any extensive wear, but the gaps on all four were well over ideal. Like I said, if you're at 150k, it couldn't hurt and is worth the forty bucks.
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Holla at cho' koala.
"Roxie" - 2004 CL9 6MT - Satin Silver Metalllic
Mods planned in the wake of an unfortunate total:
-LED tail retro from MMSport
-H&R Sport Springs
-Bilstein B6 HD Shocks
-CT Engineering Icebox
Mods Thus Far:
-Alba Engineering Short Shifter
-CorSport Shifter Base Bushings
-Interior LEDs from exLED.com
-Kazera KZ-Vs 17x7 w/255/50/17 Continental ExtremeContact DWSs
-CT Engineering 22mm rear sway bar