Changed mine 233k, they were original as far as I know. One was nailing and the car didn't really idle or start to well. Now it idles smooth, no more noise, and better starting. I also did glowplugs at the same time, so they might have contributed to the better starting. However there was no indication that they were not working. (if you are familer with the 603's you know why I changed them)

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200