In nearly 40 years of working on my own cars, I’ve been exposed to a staggering variety of products that promised to make vehicles more reliable, powerful, and efficient. In days of yore, these products were largely limited to liquid additives like Marvel Mystery Oil, SeaFoam engine treatment, and Liqui Moly Engine Flush. While these additives can actually help condition worn seals and gaskets and improve the friction of engine internals, some more recent products focus on the computers
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