Gold Eagle Co. STA-BIL Diesel Formula Fuel Stabilizer and Performance Improver
Priced as of May 17, 2026
4.8(1,488 ratings)Subscribe & Save: $20.39 (15% off)Buy on AmazonSaved to your guest loadout. Sign up to also save to your Cabinet (consumables) or Kit (tools you own).
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Prices may varyCarCareTruth's Analysis
Last reviewed May 17, 2026
TL;DR No named cetane improver, detergent active, or lubricity additive — SDS §3 is six aromatic solvents plus one proprietary ingredient (0–15%). Brand claims stabilization, cleaning, and lubrication with no identified chemistry to support them. DANGER signal word from H304 aspiration and H360 reproductive toxicity — Serious Hazard band at concentrate.
What it is and how it performs
STA-BIL Diesel Formula is a petroleum-distillate-based additive for year-round diesel use. SDS §3 discloses hydrotreated naphthenic distillate (0–40%), xylene (0–25%), solvent naphtha (0–10%), naphthalene (0–5%), ethylbenzene (0–5%), trimethylbenzene (<1%), and a single proprietary component (0–15%). That proprietary ingredient is the sole candidate for any stabilizer, detergent, or lubricity function — no 2-EHN, no PEA-family detergent, no ester or amide lubricity chemistry is disclosed. The three label claims (stabilizes fuel 12 months, cleans injectors, lubricates fuel components) have no verifiable chemistry basis from the SDS. Strong 4.8-star Amazon rating across 1,488 reviews, though feedback is predominantly general sentiment.
Who should buy this — and who should skip it
Fits diesel owners wanting a recognized-brand fuel stabilizer for seasonal storage. Skip it for documented cetane improvement, injector cleaning, or lubricity protection — products disclosing named actives deliver verifiable function this formulation cannot match.
Safety and environmental impact
SDS §2 classifies DANGER from H304 (aspiration Cat 1) and H360 (reproductive toxicity Cat 1B, xylene-driven), plus H351 (suspected carcinogen Cat 2) and H336 (narcotic effects). Naphthalene and xylene are both Prop 65 listed. The concentrate pour at the tank fill neck is the primary exposure — full-strength aromatic vapors for 15–45 seconds. SDS §9: 100% VOC. Combustion-exhaust pathway; aromatic carriers carry ingredient-level aquatic toxicity.
Frequently asked questions
Does STA-BIL Diesel Formula improve cetane number?▾
The label says 'Performance Improver,' but SDS §3 does not disclose a cetane improver — no 2-EHN (2-ethylhexyl nitrate) or DTBP (di-tert-butyl peroxide) is listed. The only non-solvent ingredient is a single proprietary component at 0–15%. Without a named cetane improver, there is no independent basis to evaluate a cetane-improvement claim.
What does the STA-BIL Diesel Formula actually contain?▾
SDS §3 lists seven components — six are aromatic carrier solvents (hydrotreated naphthenic distillate, xylene, solvent naphtha, naphthalene, ethylbenzene, 1,2,4-trimethylbenzene). The seventh is a proprietary ingredient at 0–15% — the only candidate for any functional active such as a stabilizer, detergent, or lubricity agent.
Is this product safe to use in all diesel engines?▾
The Amazon listing states compatibility with all Ultra-Low Sulfur Diesel (ULSD) and biodiesel blends. No community-documented compatibility failures were found across 1,488 Amazon reviews. Gold Eagle does not publish an OEM-specific compatibility list.
Why does this product carry a Prop 65 warning?▾
The Amazon listing carries a California Proposition 65 warning. Naphthalene (CAS 91-20-3) and xylene (CAS 1330-20-7) are both named on the Prop 65 list — naphthalene as a carcinogen, xylene as a reproductive toxicant. Both are disclosed carrier solvents in SDS §3.
From the manufacturer
Marketing copy from Gold Eagle Co., via Amazon. Not editorial.
- •Advanced Sludge and Sediment Prevention: Unleash the power of our diesel fuel additive, designed to act as a formidable shield against sludge and sediment formation. It actively prevents the accumulation of harmful deposits in your fuel system, ensuring a cleaner and more efficient engine performance.
- •Comprehensive Fuel System Care: Our diesel fuel additive not only prevents sludge and sediment but also cleans and lubricates your entire fuel system. From fuel injectors, pumps, and tanks this additive is a thorough caretaker, enhancing the longevity and efficiency of your engine.
- •Specially Formulated STA-BILizers: Our formulation includes specially crafted STA-BILizers that provide an extra layer of protection against corrosion. These additives are tailored to combat the elements that can compromise the integrity of your diesel fuel, ensuring durability and long-lasting performance.
- •Oxidation Reduction for Optimal Fuel Stability: Say goodbye to fuel oxidation issues caused by thermal breakdown. Our diesel fuel additive actively reduces oxidation, contributing to enhanced fuel stability. This not only preserves the quality of your diesel but also maintains optimal combustion conditions for improved engine efficiency
- •Water Elimination Technology: This additive doesn't just stop at fuel quality; it actively removes water, safeguarding your engine from the detrimental effects of water contamination. By eliminating water from the fuel system, our additive ensures that your engine operates in a clean and moisture-free environment, promoting consistent and reliable performance.
- •Universal Compatibility: Embrace versatility with a diesel fuel additive that is compatible with all Ultra-Low Sulfur Diesel (ULSD) and biodiesel blends. Whether you're using the latest fuel formulations or eco-friendly biodiesel blends, our additive ensures seamless integration, making it a reliable choice for a wide range of diesel engines.
- •All STA-BIL branded products are good for use up to 2 years after the bottle was opened. Be sure to mark the date you opened the bottle on the back of your package!
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Manufacturer specifications
- Brand
- STA-BIL
- Scent
- Unscented
- Specific Uses For Product
- specific_uses_for_product
- Item Volume
- 946 Milliliters
- Unit Count
- 1.0 Count
- Special Features
- Clean & lubricate entire fuel system, Made in the U. S. A., Prevent sludge and sediment formation, Protect against corrosion, Reduces oxidation of diesel fuel caused by thermal breakdown
- Contains Liquid Contents?
- No
- Container Type
- container
- Recommended Uses For Product
- Dog_toy
- Number of Items
- 1
- Item Weight
- 900 Grams
- Size
- 1 Count (Pack of 1)
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