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I just bought a 2004 Mustang with 89k on it. I do not know if a Fuel System Cleaner Additive or a Transmission Cleaner Additive has been used on it before. Will it hurt my engine to use these additives? If not which ones would you recommend?
 

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In tank fuel system cleaners do nothing and are a waste of time. Never use a cleaner inside a transmission, normal servicing is what it needs.
 
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