Gas - Additives

Doc's Auto Parts Premium Gas Vehicle Additives

Protect What's Under The Hood

Keeping a gas engine running clean isn't just about what you put in the tank—it's about what you add to it. Fuel system deposits, carbon buildup, and degraded lubricants quietly chip away at engine performance over time. Doc's Auto Parts carries a full lineup of gas vehicle additives that fight back: fuel system cleaners, oil treatments, injector cleaners, and more—all designed to help your engine run cleaner, last longer, and perform like it should.

Real Results, No Snake Oil.

We don't carry products that make big promises and deliver nothing. Every additive in our lineup is selected for real, measurable results—reduced deposit buildup, restored fuel economy, smoother idle, and better overall engine health. Whether you're dealing with a rough idle, decreased MPGs, or just want to stay ahead of wear before problems start, our additives are a smart, affordable way to protect your investment. And because we stand behind what we sell, you can trust that what you're putting in your engine is worth it.

Find The Right Additive for Your Vehicle.

Not sure what your gas vehicle needs? Use our Vehicle Selection Tool to narrow down the right products for your year, make, and model. Whether you're looking for a one-time injector flush or a routine fuel system treatment, we'll help you find the right solution fast.

Free Shipping on U.S. Orders $99+ - Keep Your Engine Healthy For Less

At Doc's Auto Parts, we believe maintenance shouldn't break the bank. Our additives are priced competitively because a well-maintained engine saves you money in the long run—and we want to make it easy for you to stay on top of it. Stack your order with filters, fluids, and additives and ship it all free on orders over $99 anywhere in the U.S. A little prevention today keeps the big repair bills away tomorrow.