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Seafoam. Cleans out an engine quick, but change your oil within 500 miles if you put it in the crankcase.
I don't know any reasons to support this, but I have heard that Lucas is mostly snake oil and marketing. Maybe it works differently in different cars, or some makes don't tolerate it. Whatever you use, change your fuel filter regularly and go to the same gas station every time, if you can. That should cut down on crappy gas/contaminants.
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