What are the positive-negative effects of using marvel mystery oil in the gas tank of a 1993 Toyota Camry?

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I use this product often. The positive effect is that it lubricates the fuel pump which is in the gas tank and cleans and lubricates the injectors plus lubes upper cylinder walls. I don't know of or heard of any negative effects about using this product.

First answer by Z-Man. Last edit by Z-Man. Contributor trust: 98 [recommend contributor recommended]. Question popularity: 11 [recommend question].