You care about your car. You obsess over the finish, you use the right wash technique, and your wheels shine harder than most people’s windshields. But what’s happening under the hood? What’s running through the veins of your engine, your fuel system, your oil channels?

We built our additives range for the same reason we built our surface products: because the stuff on shelves wasn’t cutting it.

Why Most Additives Don’t Cut It

Walk into any motor factors store and you’ll find shelves lined with cheap fuel treatments, oil boosters, and engine cleaners. But here’s the truth: most of them are loaded with filler, watered-down chemistry, and ingredients that make big promises and deliver nothing but a placebo effect.

A lot of brands rely on generic formulations, licensing the same tired base and throwing a new label on the bottle. You get something that smells strong, maybe even feels slick, but it isn’t doing the job where it counts—deep in the internals, where carbon builds, sludge thickens, and performance dies a slow death.

We weren’t about to put our name on something like that.

Built From the Same Engineering Obsession

Just like our coatings and cleaners, our additives were built from scratch—in labs, on the bench, and in the field. Every formula was designed to solve a problem, not just mask one.

We started with one question: What would we actually want running through our own engines?

Then we got to work.

• Fuel System Cleaner: Developed to dissolve injector deposits, improve atomization, and restore lost throttle response. Not just “cleaning the tank,” but optimizing combustion.

• Oil System Conditioner: Designed to reduce internal friction, restore seal elasticity, and clean out old sludge that steals horsepower.

• Octane Boost & Performance Enhancer: For those who want every bit of power their setup can deliver. Smooths knock, sharpens ignition, and keeps performance crisp under load.

These are real solutions. Not marketing juice.

What Sets Them Apart

Our additives are:

• High-concentration: You’re not paying for solvent or dye. Every dose is potent.

• Purpose-built: Each formula is targeted and tested for real results.

• Engine-safe: No caustics, no shortcuts, no side effects.

• Track-proven: We test in the lab and on the redline.

They don’t just meet the standard. They raise it.

The Shelby Standard, Under the Hood

Our detailing products are known for slick finishes, brutal protection, and chemical precision. We took that same mindset and went internal.

Why? Because performance doesn’t stop at the surface.

Clean fuel injectors mean better combustion. Restored oil flow means better efficiency. Additive strength means longer life, tighter tolerances, and smoother power delivery.

The outside should shine. The inside should scream.

How to Know If You Need Additives

If you:

• Notice sluggish throttle or lost performance

• Run the same oil change routine without extra protection

• Drive in stop-start city traffic or high-heat conditions

• Use pump fuel on a tuned setup

• Just want to protect your investment the same way you protect your paint...

Then yeah. You probably need to start running additives.

Built to Protect. Built to Perform.

Our additives are chemical armor for the internals. They're not cheap, they're not diluted, and they don't pull punches. Because just like your paint, your engine deserves the best.

No filler. No fluff. Just engineered performance in every bottle.

Want to Run Stronger? Explore the full Additives Range. Protect the parts you can’t see—and feel the difference where it counts.

Shelby Performance Additives. Under the hood, over the top.