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I've got a 2002 with 200k miles on it and looking to get back to optimal performance. I've seen Marvel Mystery Oi, Gumout Multi System, Xado additives, Lucas Oil etc... which ones have you tried, and have you noticed increase in engine performance ?
 

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I replaced the engine in my TB with a salvage 05. Lost oil pressure on first test drive. Added seafoam to the oil and havent had a problem since. I also use it in the gas and cleaning vaccume lines
 
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