CarCareTruth Score
Decent.
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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:
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
Translated from the manufacturer’s Safety Data Sheet, Section 2
SDS §2 classifies Eye Irritation Category 2 (H319) at the mixture level · short above-waist pour from a small bottle with splash risk is the typical 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: splash risk
Translated from the manufacturer’s Safety Data Sheet, Section 2
SDS §2 classifies Skin Irritation Category 2 (H315) at the mixture level · brief drip contact during the concentrate pour is the realistic trigger.
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 manufacturer’s Safety Data Sheet, Section 2
SDS §2 classifies Respiratory Irritation (H335) at the mixture level · a brief open-garage pour is within normal parameters, but a fully enclosed workspace elevates inhalation exposure from the petroleum carrier vapors.
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, and substitution with less toxic materials).”
Triggered by GHS H335 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.
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 #4 of 6 in Oil Additive.Three above it ↓
Last reviewed June 12, 2026
TL;DR Petroleum-based cleaning concentrate · the active chemistry is a hydrocarbon-based detergent blend with no ZDDP or tribological anti-wear compound. DANGER signal word is driven by an aspiration hazard at concentrate strength; do not induce vomiting if ingested · seek medical attention.
Sea Foam Motor Treatment uses a proprietary hydrocarbon-cleaning blend to dissolve sludge, varnish, and deposits in the crankcase and fuel system. The mechanism is solvent-detergent cleaning, not anti-wear tribology. Community evidence is substantial: highly rated by a very large owner base with consistent reports of smoother idle after crankcase pre-drain treatment. No ZDDP or phosphorus compounds · no catalytic converter concerns. Compatible with gasoline and diesel engines, conventional and synthetic oil.
Best for owners of older or high-mileage engines who suspect sludge buildup and want a cleaning pass before an oil change · and for fuel stabilization in stored vehicles or small engines. Skip if you need a genuine anti-wear additive: Sea Foam is a cleaner, not a tribological supplement.
DANGER signal word from an aspiration hazard · do not induce vomiting if ingested, seek medical attention. SDS §2 classifies skin irritation (H315), eye irritation (H319), and respiratory irritation (H335) at mixture level. No Prop 65 chemicals per SDS §15. Petroleum-derived drain-destined concentrate. Used oil goes to a collection facility · not the drain.
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