One concentrated formula. Four ways to get started. EPA registered, SAE tested, and trusted by drivers for 30+ years.
All products contain the same proven FFX formula. Choose based on how much you drive and how long you want to go between orders.
The most popular choice for serious drivers. Combines the 4oz bottle with foil packs so you always have the right format — pour the bottle for big fills, use foil packs on the go.
The classic FFX bottle. One 4oz bottle treats up to 320 gallons of fuel. Perfect for first-time users or anyone who fills up at the same station regularly.
Convenient single-use foil packs — ideal for traveling, road trips, or keeping a stash in the glove box. Tear, pour, drive. No measuring required.
The highest-volume foil pack option. 36 pre-measured packs means you're covered for months. Best per-treatment price of any foil pack option.
| Product | Format | Coverage | Best For | Price |
|---|---|---|---|---|
| 4oz Bottle | Pour-in bottle | 320 gallons | First-time users, regular fill-ups | $59 |
| 16 Foil Packs | Single-use packs | 16 fill-ups | Travel, convenience, glove box | $69 |
| Executive Pack ⭐ | Bottle + foils | Combo coverage | Everyday drivers — best overall value | $139 |
| 36 Foil Packs | Single-use packs | 36 fill-ups | High-mileage, fleets, stock up & save | $149 |
No special tools. No complicated process. Three steps and you're done.
Pour or add the recommended amount directly into your fuel tank before you fill up. For foil packs — tear and pour.
Add gas or diesel as you normally would. The fuel mixes the treatment throughout the tank automatically.
That's it. FFX works through your fuel system as you drive. No special steps, no waiting, no changes to your routine.
Join thousands of drivers who have already made the switch. Pick your option above and get started today.