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I would go ahead and treat the car. All of these engine cleaners are no more than a solvent that redissolves residues of low-volatility left by gasoline over time. Solid residues go back into solution and are then burned or eliminated.
If you are worried about putting too much dissolved junk into the fuel system at once, run two tanksfuls with half-strength treatments, followed by a full-strength treatment and them the oil change.
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Wider is Better
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