Liquid Wrench Penetrating Oil
Priced as of May 13, 2026
4.7(2,242 ratings)Subscribe & Save: $11.16 (5% 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 varyFrom the Safety Data Sheet
Full SDS ↗ (rev. 2018-05-15)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.
EyesRecommendedMfr. SDS §8 · 29 CFR 1910.133(a)(1) · GHS H319SkinRecommendedMfr. SDS §8 · 29 CFR 1910.138(a) · GHS H315LungsSituationalMfr. SDS §8 · 29 CFR 1910.1200(f) · GHS H304Ventilation—No PPE in published sourcesShow details for all categories ▾Hide details ▴
From the manufacturer’s Safety Data Sheet, Section 8
“SDS §2 classifies Eye Irritation Category 2A (H319) at the mixture level — aerosol mist is the primary exposure pathway.”
— Liquid Wrench
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.
From the manufacturer’s Safety Data Sheet, Section 8
“SDS §2 classifies Skin Sensitizer Category 1B (H317) at the mixture level — regular contact with the petroleum-distillate carrier is the exposure driver.”
— Liquid Wrench
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.
From the manufacturer’s Safety Data Sheet, Section 8
“Aerosol form factor creates fine mist near face level. H335 (respiratory irritation) is absent from §2 mixture classification — aerosol mist in an enclosed space is the primary inhalation exposure scenario.”
— Liquid Wrench
U.S. regulatory standard
29 CFR 1910.1200(f); 1910.132(d)
“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.
The published Safety Data Sheet for this product does not specify ventilation protection for consumer use.
Workplace context
29 CFR 1910.134(a); 1910.1000
“the primary objective shall be to prevent atmospheric contamination [via] accepted engineering control measures (for example, enclosure or confinement of the operation, general and local ventilation…).”
Triggered by GHS H336 on the SDS.
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
PPE tiers translate the manufacturer’s SDS and U.S. regulatory standards. Not professional safety advice. How we report safety.
CarCareTruth's Analysis
Last reviewed May 15, 2026
TL;DR DANGER-rated aerosol with a confirmed Prop 65 warning — aspiration hazard if swallowed, confirmed skin sensitizer at the mixture level. Works reliably on light-to-moderate rust in 10–20 minutes; PTFE/Cerflon residue delivers genuine anti-seize protection most budget-tier oils skip. Aerosol mist in an enclosed space is the primary inhalation concern.
What it is and how it performs
Liquid Wrench Penetrating Oil breaks the rust's grip on seized fasteners. Spray on, direct the straw into tight threads, wait 10–20 minutes, and try to turn. PTFE/Cerflon residue means treated fasteners turn freely at next service — few budget-tier oils deliver that. The heavier-fraction carrier limits capillary reach into deep blind bores; performance on accessible threads is at the category median.
Who should buy this — and who should skip it
A solid first reach for homeowners and weekend mechanics wanting anti-seize protection in the penetrating step. For regular enclosed-space use, the DANGER signal word, Prop 65 warning, and skin sensitization classification at §2 mixture level are the documented SDS risk factors to weigh.
Safety and environmental impact
DANGER signal word is driven by an aspiration hazard — do not induce vomiting if swallowed; seek medical attention. Prop 65 warning is on the current label (2018 SDS §15 contradicts this; label takes precedence). Skin sensitization and eye irritation are classified at the mixture level; aerosol mist in an enclosed space is the inhalation scenario — no respiratory-irritant classification at the mixture level. The carrier is not readily biodegradable, one ingredient is confirmed bioaccumulative, and the product is toxic to aquatic life with long-lasting effects.
: Amazon listing B000ZZWNYG — "Cerflon Ceramically-Reinforced PTFE — Fast acting anti-seize formula"; accessed 2026-05-13.
: Acme Tools listing — Prop 65 cancer/reproductive harm warning confirmed on product label; accessed 2026-05-13.
From the manufacturer
Marketing copy from Liquid Wrench, via Amazon. Not editorial.
- •LIQUID WRENCH is a local family owned company based out of Charlotte, NC. For more than 75 years, LIQUID WRENCH products, developed by the people who use them, has earned the trust of hard-working tradesment and the active DIYer through consistent, superior performance and a commitment to innovation.
- •Frees stuck nuts, bolts, and locks.
- •Powerful formula dissolves rust and cuts through grease.
- •Low odor, 0% VOC, and safe on painted surfaces, plastic & PVC. 50-State compliant. Proudly Made 100% in the USA!
- •Top Uses: Rusty nuts, bolts & hinges. Clamps & Pipe fittings. Locks & Latches. Frozen mechanisms. Nozzles and hose pipe fittings.
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Manufacturer videos
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Manufacturer specifications
- Material
- Blend
- Brand
- Liquid Wrench
- Package Information
- Bottle
- Liquid Volume
- 5.5 Fluid Ounces
- Item Weight
- 0.09 Pounds
- Brand Name
- Liquid Wrench
- Recommended Uses For Product
- Lubricant
- Item Form
- Oil
- Global Trade Identification Number
- 00076335005232, 00078698120133
- Manufacturer
- BBI- Blumenthal Brands Integrated (Gunk and Liquid Wrench)
- Unit Count
- 5.5 Ounce
- UPC
- 076335005232 078698120133
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