Snake oils do quite well everytime fuel gets pricey. For a number of reasons, some people are stupid, others just don't know any better, and others still want to beleive and support it with junk science.

If an OE doesn't use it somewhere its snake oil, they have a vested interest in improving MPG's. High mpg, sells cars.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200