STA-BIL Diesel Fuel Stabilizer 32 oz — Treats 320 gal, protects injectors & prevents oxidation

Designed for diesel vehicles, equipment and stored fuel tanks, this 32 fl. oz. bottle treats up to 320 gallons to slow oxidation, reduce water contamination, and help keep injectors and pumps cleaner. The formula combines detergents, corrosion inhibitors and lubricity enhancers to maintain fuel quality during long storage periods and protect fuel system components.

How will this product help my diesel sit unused over winter or long storage?

It stabilizes diesel so the hydrocarbons don’t break down as quickly, reducing varnish and gum formation that can clog filters and injectors. The additive also helps separate and disperse small amounts of water and includes corrosion protection for metal surfaces inside the tank and lines.

• Stabilizes fuel chemistry to prevent oxidation and varnish formation.
• Helps eliminate small free-water droplets that harm injectors.
• Provides corrosion inhibitors to protect tanks and pumps.

Can I use STA-BIL Diesel Fuel Stabilizer in biodiesel or ultra-low sulfur diesel?

Yes — the formula is compatible with ULSD and common biodiesel blends, helping them resist degradation and maintain proper lubricity. Always follow recommended dosing for higher biodiesel ratios to ensure optimal protection.

• Compatible with ULSD and many biodiesel blends.
• Recommended dose treats up to 320 gallons per 32 oz bottle.
• Helps maintain lubricity lost during sulfur reduction in diesel fuels.

Will this cleaner improve engine performance right away?

You may notice smoother idling and fewer startup issues after treatment, especially if the fuel system had mild deposits or water contamination. Significant cleaning of heavy deposits takes longer and is most effective when used as part of regular fuel maintenance.

• Helps dissolve and disperse light deposits in injectors and lines.
• Improves pump and injector lubrication for more consistent fuel delivery.
• Reduces risk of clogged filters and rough startups when used preventively.

How should I store and use this bottle for best results?

Keep the bottle sealed when not in use and mark the open date — STA-BIL products remain effective for up to two years after opening. Add the recommended dose to a full tank before storage or before extended downtime for the most even distribution and protection.

• Store sealed in a cool, dry place and mark the open date on the bottle.
• Add to a full tank for even mixing and maximum protection.
• One 32 oz bottle treats about 320 gallons; adjust dose proportionally.

Who is this for: STA-BIL Diesel Fuel Stabilizer 32 oz is aimed at owners of diesel cars, trucks, boats, farm equipment and backup generators who need long-term fuel protection. It’s useful for seasonal equipment that sits idle, fleet managers seeking preventive care, and anyone using biodiesel blends who wants to reduce oxidation, water issues and wear on fuel system components.