CarCareTruth Score
Mediocre, but wear gloves and ventilate.
Priced as of June 7, 2026
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Prices may varyThe manufacturer's Safety Data Sheet classifies this product with one or more GHS Category 1 health hazards — the most severe tier. The hazard statements in quotes below are the verbatim GHS language from the SDS, as required by OSHA's Hazard Communication Standard. The line under each statement translates the GHS classification into plain language.
GHS Category 1 aspiration toxicity — thin, oily liquids can slip into the lungs if swallowed, causing chemical pneumonia.
If swallowed, inhaled, or splashed in eyes:
Call Poison Control immediately at 1-800-222-1222 (US, 24/7, free) and have the product container with you. Poison Control's standing guidance is to not induce vomiting after chemical exposure; they will direct first-aid steps based on the specific product.
About this product's hazards. This product's Safety Data Sheet uses signal word danger. Read the manufacturer's SDS and follow all safety instructions before use. CarCareTruth ratings translate the manufacturer's safety sheet. They do not replace the SDS or substitute for a hazard assessment specific to your task.
This product ranks #4 of 5 in Diesel Treatment.Three above it ↓
Last reviewed June 7, 2026
TL;DR Uses 2-EHN (2-ethylhexyl nitrate) as the named cetane improver · confirmed in the SDS at 25-35% by weight, which is high for a consumer product. Stanadyne's OEM diesel injection pump heritage (John Deere, GM) backs the brand's credibility, and community reports on cold-start and idle improvement are consistently positive. The injector cleaning claim has no named detergent active in the SDS, and the anti-gel claim has no identified wax modifier. Health score 1.0 (Severe): DANGER signal word, aspiration hazard classification, Prop 65 warning, and high-VOC aromatic carrier make concentrate handling the primary risk.
Stanadyne Performance Formula discloses 2-EHN (2-ethylhexyl nitrate) as its cetane improver at an unusually high 25-35% concentration by weight · 2-EHN is the most independently studied cetane-improvement chemistry and directly reduces ignition delay, which smooths idle and helps cold starts. The brand's background as an OEM fuel injection pump supplier to John Deere and GM is a genuine trust signal not replicated by most aftermarket diesel treatment labels.
The injector cleaning claim is a gap in the formula: the SDS §3 shows no named PEA-family or amine-based detergent active. The aromatic carrier solvents (heavy aromatic naphtha, trimethylbenzenes) provide solvent cleaning action, but solvent-only cleaning is less targeted than a PEA-class detergent for internal injector deposits. The anti-gel claim · central to the "All Season Protection" positioning · similarly lacks a named wax-crystal modifier in the SDS. The brand notes trade secrets, so the chemistry may exist but cannot be independently verified.
The lubricity story is partial: 2-ethylhexanol (10-15%) contributes boundary lubrication via its hydroxyl group, but it is not a dedicated HFRR-tested ester or amide. Community evidence on cold-start improvement and general engine feel is strong and long-running. One 16 oz bottle treats up to 60 gallons · a clear, single-use protocol.
Best for owners running older mechanical diesel injection systems or CRDI engines on non-Top-Tier diesel who want a cetane-focused treatment with credible OEM chemistry lineage. The high 2-EHN concentration makes it a genuine cetane product, not a marketing shell · useful for cold-climate owners, sluggish-idle troubleshooting, or periodic maintenance on high-mileage diesel engines. Skip it if injector deposits are the primary goal: the absence of a named detergent active means a PEA-based product is the better tool for that job. Also skip it if your diesel fuel already meets a certified cetane spec through a Top Tier supplier · incremental gain from additional cetane treatment is unlikely to be measurable.
The SDS classifies this product DANGER, driven by H302 (harmful if swallowed), H304 (aspiration hazard · concentrate poured into lungs is a serious risk if swallowed and vomiting occurs), H315 (skin irritation), H319 (serious eye irritation), H336 (may cause drowsiness or dizziness), and H351 (suspected carcinogen). Do not induce vomiting if ingested · seek medical attention. The product carries a Prop 65 warning, driven by naphthalene and trimethylbenzene aromatics in the carrier. Estimated VOC is approximately 680 g/L from the aromatic carrier combination. The health score is 1.0 (Severe) · this product's concentrate-strength hazard profile is among the most significant in the diesel treatment category, primarily from the high-aromatic carrier and the Prop 65 carcinogens. The product combusts in the engine and exits as exhaust · the category carries a hard environment ceiling of 3; this product scores 2 due to the high-VOC aromatic carrier and naphthalene aquatic toxicity.
The label states one 16 oz bottle treats up to 60 gallons. That covers most consumer diesel fill-ups in one pour.
The brand positions it for all diesel engines. Stanadyne was an OEM fuel injection pump supplier to John Deere and GM, so the product has heritage in demanding diesel applications. No community-documented compatibility failures have been found in research. Confirm with your vehicle's manufacturer for specialty or exotic diesel systems.
Stanadyne markets this as an all-season, anti-gel product. The cold-weather performance claim has positive community corroboration from cold-climate users. The anti-gel chemistry is not identified in the SDS · it may be withheld as a trade secret.
2-EHN (2-ethylhexyl nitrate) is the most independently studied cetane improver. It raises the cetane number of diesel fuel, which reduces ignition delay and smooths cold starts. This product discloses 2-EHN at 25-35% by weight · an unusually high consumer concentration.
Marketing copy from Stanadyne, via Amazon. Not editorial.
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