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Cadillac Owners Connoisseur
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keep it fresh said:
ok i have like 17 gal in my car already will it be ok to add a fuel treatment i pumped my gas like yesterday
It depends on what the "fuel treatment" is, but it is generally better to dump them in prior to filling the tank. It might not get mixed around very well for a while. I would just wait until you need to fill the tank again.
 
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