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Originally Posted by GTP Dad
Octane booster mixes with the fuel to increase the rating. I seriously doubt that the booster caused the problem you are describing unless you put in more than the recommended amount of booster in the tank. I have used STP octane booster before with no ill effects in my GTP which has more then 140K miles on the engine. It is possible however that if you mixed the booster to less than the recommended amount of fuel it could cause problems especially with the fuel pump.
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I agree. I've used it before in my '97 GTP with no ill effects. However, it is imperative to follow STP instructions for proper dilution. One bottle per full tank. I recall Stp's Octane Booster is a two in one product. Octane boost plus combustion chamber cleaner.
If mixed properly it should not damage the CAT convertor or 02 sensors.
However, you never know.