What's in aftermarket additives anyway? | Fuel Facts

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You’ve seen them: rows upon rows of brightly colored bottles, each promising more than the next. Improved fuel economy. Cleaner engine internals. A full head of hair. Yes, we’re talking about fuel additives. 

What exactly is in those concoctions? It can vary greatly. In theory the Safety Data Sheet, usually available online, spells out their contents–helpful info should there be some kind of an accident. Sometimes, though, the SDS just provides a possible range of concentrations for individual ingredients. 

For a real-world example, let’s take a closer look at a popular additive that promises a cleaner, better-performing engine. (We won’t name it, but let’s say that this brand has long been associated with NASCAR royalty.) 

The SDS lists kerosene among its ingredients. The kicker: According to the SDS, the amount can range from 15 to 97 percent. Similar huge ranges are provided for several other additive ingredients. 

Kerosene, which is often used in fuel additives as a filler or carrier for the active ingredients, isn’t the worst thing to feed an engine, explains Zachary Santner, technical specialist with Sunoco Race Fuels. “Kerosene is a really good solvent,” he explains, “and it’s relatively safe as far as bottling it and putting it in stores.”

Thanks to the vague information found on the SDS, however, exactly what is being fed to the engine remains a mystery. The bottle might contain all active ingredients, or it might be mostly filler. 

For those who feel the need to use these aftermarket additives, Santner recommends following the directions on the bottle. Too much solvent can be harsh on gaskets or other internal components. “If one is good, two isn’t always better,” he adds. 

How can you keep your engine clean in the first place? Using a Top Tier Detergent Gasoline can certainly help, he says. This standard was unveiled in 2004 so auto manufacturers could easily specify a fuel deemed clean enough for use in their engines. 

The list of suppliers offering Top Tier Detergent Gasolines can be found at toptiergas.com, and many of the big national brands are among them, like ExxonMobil, Chevron and, yes, Sunoco. (Something that we noticed: Offering clean restrooms and artisan sandwiches doesn’t guarantee a spot on this list.)

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tolyarutunoff
tolyarutunoff New Reader
6/30/22 3:52 p.m.

i have fitch fuel catalysts in several cars, along with sealing the filler caps with plastic film.  the cars start easily after sitting for many months, even a couple years.

TurnerX19
TurnerX19 UltraDork
6/30/22 10:53 p.m.

I clicked this hoping for accurate answers, like someone who took samples to a lab and did spectrographic analysis of multiple brands. Disappointingly vague. 

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