CarCareTruth Score
Mediocre, but wear gloves and ventilate.
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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 2 acute dermal toxicity — classified as toxic in contact with skin.
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 #13 of 15 in Washer Fluid.Three above it ↓
Last reviewed June 14, 2026
TL;DR Rated to -20°F with strong, broadly trusted cleaning performance from owners. Health score is 1.0/10: this is a DANGER-class methanol formula. Methanol-free alternatives score significantly higher on health and are worth considering for households with children or pets.
PEAK's PWN0H3 is a ready-to-use blue all-season formula rated to -20°F, confirmed by SDS freeze-point data. It handles winter road salt and grime at a commodity price point, no dilution needed, in a standard gallon jug. It's well-reviewed by owners, with cleaning and streak-free performance consistent with the label claims. Available in the PEAK lineup at multiple temperature ratings; the -20°F version covers most US cold-weather driving without deep-freeze protection.
Best fit for cold-climate daily drivers in most of the US who want reliable -20°F protection at a commodity price. Not for households with chemistry concerns; the DANGER-class formula carries real handling hazards. Not for sale in California, Texas, or Maricopa County, AZ.
SDS carries DANGER: H302 (harmful if swallowed), H311 (toxic in contact with skin), H332 (harmful if inhaled), and H370 (optic nerve damage). Proposition 65 applies; methanol is listed as a developmental toxicant. SDS §8 specifies safety glasses and gloves; pour-fill outdoors is the primary exposure point. Drain-destined via stormwater runoff; no aquatic H-codes in SDS §12.
The product label and ASIN title state -20°F protection. SDS Section 9 confirms a freeze point of -28.9°C (-20°F). This is a solid mid-tier freeze rating for cold-weather US driving · adequate for most of the continental US but not for extreme northern climates that see temperatures below -20°F regularly.
Yes. SDS §3 (Old World Industries, 01/11/2018) lists methanol (CAS 67-56-1) at up to 33% by weight as the primary active ingredient. Methanol is the standard chemistry for a winter de-icer washer fluid at this temperature rating. The DANGER signal word and Proposition 65 warning both stem from the methanol content.
Not for purchase as a consumer product in California due to CARB VOC regulations that restrict methanol-based consumer products. The product carries a Proposition 65 warning for methanol as a developmental toxicant. California residents should look for a methanol-free or ethanol-based washer fluid with CARB compliance.
Methanol ingestion requires immediate medical attention. The SDS classifies this product as H302 (harmful if swallowed) and H370 (specific organ toxicity · optic nerve damage). Contact Poison Control (1-800-222-1222 in the US) or emergency services. Do not induce vomiting. Keep out of reach of children and pets.
No. The PWN0H3 is a ready-to-use (RTU) formula · no dilution is needed. PEAK offers separate concentrate products in their lineup. The PWN0H3 is designed to pour directly into the washer reservoir as-shipped.
Marketing copy from PEAK, via Amazon. Not editorial.
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