This is a little dishonest, but I know people who have gotten old cars to pass CT emissions with rubbing alcohol. But it is better than selling the car, or you could try some of those chemicals they sell at autopart stores.

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1969 280SE
2027 Ram 1500
2026 Genesis GV70
2007 Tiara 3200
1988 Egg Harbor 37
1981 Boston Whaler 17