The central truism regarding any fuel additive is that sometimes you need it—and sometimes you don’t. Aside from the untold legions of snake oil substances touted to improve fuel economy, there are many legitimate and thoroughly tested fuel additives that offer a wide range of important benefits to today’s complex diesel powertrains, but only if they are mixed in with a high level of precision. In fact, many diesel fuel blends on the market today come pre-mixed with any ...

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