CarCareTruth Score
Decent.
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Prices may varyHealth 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
Translated from the manufacturer’s Safety Data Sheet, Section 8
H319 (serious eye irritation, Cat 2A) is classified in SDS §2. SDS §8 specifies eye protection during handling. Pour-fill and top-off use cases carry a splash risk as the trigger, not continuous or spray exposure.
U.S. regulatory standard
29 CFR 1910.133(a)(1)
“The employer shall ensure that each affected employee uses appropriate eye or face protection when exposed to eye or face hazards from… liquid chemicals…”
ANSI Z87.1 (incorporated via §1910.6)
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.
Only when: prolonged use
Translated from the manufacturer’s Safety Data Sheet, Section 8
H315 (skin irritation, Cat 2) is classified in SDS §2, which is what drives the skin tier. SDS §8 specifies chemical-resistant gloves where skin contact is possible. Trigger: drain work or extended contact with concentrate.
U.S. regulatory standard
29 CFR 1910.138(a)
“appropriate hand protection when employees' hands are exposed to hazards such as those from… chemicals which produce an adverse effect on the skin or eyes…”
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.
Only when: in enclosed space
Translated from the ingredient chemistry
No inhalation H-codes are present in SDS §2. Ethylene glycol and diethylene glycol have negligible vapor pressure at ambient temperature; SDS §8 carries no respiratory protection requirement for normal use. Situational risk is limited to draining hot coolant in enclosed engine compartments where steam may be present.
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.
This product ranks #18 of 21 in Coolant / Antifreeze.Three above it ↓
Last reviewed June 9, 2026
TL;DR Meets ASTM D3306 and D4340 with an OAT (organic acid technology) inhibitor package, phosphate-free and silicate-free, but carries no named OEM approval numbers. Ethylene glycol base: the H302 (harmful if swallowed, Cat 4) classification applies; keep this coolant secured from pets and children, or choose a propylene glycol alternative.
Peak Long Life is a pre-diluted 50/50 OAT coolant meeting ASTM D3306 and D4340, the baseline performance specs for passenger car cooling systems. The OAT inhibitor package supports a manufacturer-stated 5-year/150,000-mile drain interval; community VOA data confirming the 150k-mile mark is limited on BITOG as of 2026. Ethylene glycol base (90-97% by weight); the pre-diluted formula adds deionized water and a denatonium benzoate bittering agent. Available on Amazon in 2-pack or 6-pack only; single gallons are sold in-store at Walmart, AutoZone, and O'Reilly.
Best for owners of older or less-restrictive vehicles (pre-2010 domestic or Asian-brand cars) needing a budget OAT coolant for a basic flush and fill without paying for an OEM-specific formula. Skip this if your vehicle's owner's manual specifies a named OEM coolant (GM DEXOS, Ford WSS-M97B44-D, VW TL 774-G, Toyota SLLC); Peak Long Life carries no published OEM document endorsements and the wrong inhibitor package can cause corrosion in OEM-specific systems. Also skip if you need a propylene glycol formula for a pet- or child-safety reason.
Signal word: WARNING. The primary hazard is H302 (harmful if swallowed, Cat 4) from the ethylene glycol base at 90-97% by weight; the product also carries a California Proposition 65 warning for ethylene glycol (developmental toxicity). The denatonium benzoate bittering agent at 30-50 ppm meaningfully reduces palatability but does not change the H302 classification. SDS §8 specifies gloves where skin contact is possible (H315) and eye protection for splash risk (H319); no inhalation H-codes are present and SDS §8 specifies no respiratory protection for normal pour-fill at ambient temperature. Collect spent coolant for recycling at auto parts stores; do not drain to ground or storm sewer.
Peak markets Long Life as compatible with 'all makes and models.' No named OEM spec document numbers (GM DEXOS, Ford WSS-M97B44-D, Toyota SLLC, VW TL 774-G, etc.) were found on the label, the product listing, or in any available technical data sheet as of May 2026. Owners of vehicles with strict OEM coolant specifications, particularly European vehicles (VW, BMW, Mercedes) or newer Asian OEM systems, should verify the correct specification from their owner's manual before using a generic OAT formula.
Ethylene glycol (EG). The SDS (Section 3) lists ethylene glycol at 90-97% by weight. Ethylene glycol is acutely toxic if swallowed; the H302 classification (harmful if swallowed, Cat 4) applies, and the product carries a California Proposition 65 warning for ethylene glycol (developmental toxicity). If you need a less-toxic alternative for a household with pets or children, propylene glycol-based coolants are materially safer on this axis.
Denatonium benzoate is a bittering agent added at 30-50 ppm to deter accidental ingestion by pets and children. Ethylene glycol has a mildly sweet taste that can attract animals; denatonium benzoate is one of the most bitter compounds known. Its presence is disclosed on the product listing feature bullets ('Product contains bittering agent - denatonium benzoate'). This additive meaningfully reduces palatability but does not alter the H302 toxicity classification; the product is still harmful if swallowed.
Peak claims 5 years / 150,000 miles when a complete cooling system flush and fill is performed (not top-off use). The 5-year portion of this claim is consistent with OAT inhibitor chemistry, which degrades more slowly than silicate-based (IAT) coolants. Independent used-coolant analysis (VOA) data specifically corroborating the 150,000-mile portion of the claim is limited in public community forums (BITOG) as of 2026. Standard guidance: test your coolant's pH and inhibitor reserve at 3-year intervals rather than relying solely on the label claim.
No. Ethylene glycol coolant, used or fresh, must be collected and brought to a recycling program. Most auto parts stores (AutoZone, O'Reilly Auto Parts, Advance Auto Parts) accept used coolant at no charge. Storm drain or ground disposal is prohibited under the Clean Water Act in most US jurisdictions and causes documented harm to aquatic environments and wildlife. The sweet smell of EG also attracts animals, increasing the risk of ingestion if spilled or left in open containers.
The listing for PEAK Long Life 50/50 Prediluted Antifreeze & Coolant carries a California Prop 65 warning. PEAK Long Life 50/50 Prediluted Antifreeze & Coolant is a working automotive fluid rather than a passive part, so the warning points at the formulation itself. The manufacturer's Safety Data Sheet is the primary source for what is in it: the hazard classification and the PPE tiers on this page are translated from that sheet, and the full SDS is linked from the safety panel. California requires the warning whenever exposure to any of roughly 900 listed substances is possible. It does not name which substance applies to a given product, and it states no dose or risk level, so it is not on its own a measure of how hazardous this fluid is in normal use.
Marketing copy from PEAK, via Amazon. Not editorial.
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