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What is the normal interval of changing this thing?
I am also searching for a web site that i had bookmarked and lost. It contained the service schedule of all the C4 vettes. It also had the factory recall or service notices. It was a great website, I unfortunately lost it. I believed it was tied to someones performance shop.
I believe the factory interval is 50K miles. It might be 75K miles. I would change them at 50K as we have seen a lot better fuel economy and power by changing them in cars with ~50K miles.
Good Luck,