CarCareTruth Score
Mediocre, but it's tough on the environment.
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The 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:
The aspiration hazard (H304) is about the liquid being swallowed and reaching the airway, not about breathing fumes during normal use.
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.
Health score is for adult use as intended, per the manufacturer's SDS. It does not model child ingestion, accidental spill cleanup, or off-label use. See the safety panel below for full hazard classification, and /disclaimer for the full editorial scope.
GHS hazard codes are quoted from the manufacturer’s Safety Data Sheet. PPE tiers below translate those codes and the listed ingredient chemistry; they are not CarCareTruth recommendations.
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Only when: splash risk
Beyond SDS: translated from the ingredient chemistry
SDS section 8 explicitly recommends goggles giving complete eye protection. No H319 at the mixture level, but 2-ethylhexan-1-ol and 1,2,4-trimethylbenzene carry H319 at the ingredient level and the open tank pour creates realistic splash risk from a consumer bottle without a pour spout.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
Translated from the manufacturer’s Safety Data Sheet, Section 2
H312 (harmful in contact with skin, Acute Tox 4 dermal) present at the mixture level - more severe than skin irritation and escalates skin PPE to required per the category rubric's H312 hard-escalation rule. SDS section 8 explicitly recommends protective gloves and clothing.
U.S. regulatory standard
29 CFR 1910.132(d); 1910.1200(f)
“The employer shall assess the workplace to determine if hazards are present, or are likely to be present, which necessitate the use of personal protective equipment.”
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
Beyond SDS: translated from the ingredient chemistry
H332 (harmful if inhaled) at the mixture level from the 2-EHN cetane improver at 60-80 percent concentration. The fuel tank pour concentrates vapors briefly at the fill neck. SDS section 8 recommends respiratory equipment when ventilation is insufficient.
U.S. regulatory standard
29 CFR 1910.134(a); 1910.1200(f)
“The employer shall assess the workplace to determine if hazards are present, or are likely to be present, which necessitate the use of personal protective equipment.”
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
No PPE specified in published sources for ventilation. Absence does not imply “not needed” — consult the full Safety Data Sheet.
PPE tiers translate the manufacturer’s SDS and U.S. regulatory standards. Not professional safety advice. How we report safety.
Scope of these PPE tiers. The tiers on this page translate the product's Safety Data Sheet where one is published, plus its ingredient chemistry, into a comparable rating. They describe a formulation, not a situation: a tier is not a safety determination for any specific user, task, quantity, or environment. The manufacturer's label and use instructions govern how the product is handled. Where the product is used at work, the employer's PPE program and hazard assessment under 29 CFR 1910.132 decide what protection is selected, not this page.
No warranties. CarCareTruth makes no warranties, express or implied, and expressly disclaims the implied warranties of merchantability and fitness for a particular purpose.
Last reviewed July 31, 2026
TL;DR The cetane improver is confirmed from the reference SDS, the most independently studied chemistry class for diesel combustion quality, paired with an undisclosed proprietary detergent and lubricity package. Brand states up to 8 cetane points and 43% wear reduction, but no independent test data is published for this product. Health score of 5.0 lands in the Hazardous band: the reference SDS carries a DANGER signal word, and the concentrate is an aspiration hazard, meaning it can seriously damage the lungs if it enters the airways, so it should never be siphoned or handled in a way that risks swallowing it.
AR6500 combines a strong cetane boost with injector cleaning and lubricity protection in a single every-tank treatment. The cetane improver is confirmed from the reference SDS, and the brand states it delivers up to 8 cetane points, though no independent test result backs that claim. The detergent and lubricity actives are undisclosed. Community reception is overwhelmingly positive and highly rated on Amazon, with particular enthusiasm from Ford 7.3L and 6.0L Powerstroke owners who report smoother idle and improved cold-start response. The treat rate is 1 oz per 10 gallons, dosed at every fill-up. One recurring complaint: the bottle redesign removed the attached dosing hose, forcing owners to use a separate funnel.
Best for Powerstroke and other diesel truck owners running non-Top-Tier fuel who want a combined cetane and cleaning treatment with strong community credibility. Skip it if the undisclosed detergent and lubricity chemistry is a dealbreaker; products with named PEA detergent actives and published HFRR wear-scar data provide more verifiable value.
The reference SDS carries a DANGER signal word: harmful if swallowed, harmful in contact with skin, and harmful if inhaled, all driven primarily by the 2-EHN cetane improver concentration. The concentrate also carries an aspiration hazard classification, meaning it can cause serious lung damage if it enters the airways during swallowing or vomiting; the SDS specifically instructs against inducing vomiting if the product is ingested. The tank-neck pour at full concentrate strength is the primary exposure window, and SDS Section 8 calls for goggles, gloves, and respiratory protection when ventilation is inadequate. A California Prop 65 warning applies because naphthalene, a listed carcinogen, is disclosed as a trace constituent (under 1%) of the reference SDS's aromatic carrier fraction. High-VOC concentrate (estimated >550 g/L) combined with aquatic-toxic and bioaccumulative carrier components drives the environment score to the bottom of the category range. All health and environment scores are based on the sibling AR6900-D MAX SDS; partial confidence applies because AR6500's own formulation has not been independently confirmed to match.
The closest available safety data sheet, for the sibling AR6900-D MAX formula, identifies 2-EHN (2-ethylhexyl nitrate) as the cetane-boosting active at a high concentration. Archoil has not published an independent ASTM D613 cetane test for AR6500 specifically.
Archoil markets it for all diesel vehicles, but there is no published OEM compatibility documentation. Owner reports concentrate heavily on Ford 7.3L and 6.0L Powerstroke engines, with no compatibility failures reported in the reviews examined.
No. AR6500 is not marketed as an anti-gel product, and the reference safety data sheet does not disclose a wax-crystal modifier or cold-flow improver.
The label directs one ounce per ten gallons at every fill-up rather than as an occasional treatment.
The closest available safety data sheet discloses naphthalene, a California Prop 65 listed chemical, as a trace constituent under 1 percent of the aromatic carrier fraction.
Marketing copy from Archoil, via Amazon. Not editorial.
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