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 1 aspiration toxicity — thin, oily liquids can slip into the lungs if swallowed, causing chemical pneumonia.
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.
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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From the manufacturer’s Safety Data Sheet, Section 8
“H319 (eye irritation Cat 2A) in SDS §2 · aerosol mist in engine bay can cause temporary eye irritation on direct contact. No H318 (serious eye damage) present; situational is the correct tier for H319 without H318.”
— Stens
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
“No H315 or H314 in SDS §2 · primary hazard is inhalation and aspiration, not dermal. Gloves advised for prolonged or repeated contact given the aggressive solvent load.”
— Stens
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
“DANGER signal word driven by health H-codes (H304 aspiration hazard, H336 narcosis, H373 repeated-exposure organ damage). Acetone-dominant aerosol formula in engine bay creates meaningful inhalation exposure. SDS §8 directs organic-vapor cartridge respirator with full facepiece. Use outdoors or with garage door fully open.”
— Stens
U.S. regulatory standard
29 CFR 1910.134; 1910.138; 1910.1000
“the primary objective shall be to prevent atmospheric contamination…”
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
UN GHS hazard statement
H373“May cause damage to organs through prolonged or repeated exposure”
UN GHS Rev. 9 (2021)
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.
This product ranks #15 of 16 in Carburetor Cleaner.Three above it ↓
Last reviewed June 17, 2026
TL;DR OEM-compatible replacement for Gunk M4712. Acetone-dominant aerosol, DANGER signal word, Prop 65 warning for ethylbenzene. Cleans oily PCV film and intake varnish; evaporates fast. No explicit O2-sensor-safe or cat-safe claim on the label · aromatic content (xylene at 2.5·10%) is above the sensor-safe threshold.
Pressurized 12 oz aerosol for throttle body bores and air intake tracts on port-injected engines, marketed as a drop-in replacement for the Gunk M4712. Dissolves oily PCV film and light varnish, then evaporates cleanly. Owners report adequate routine maintenance results. Keep overspray away from the MAF sensor and downstream O2 sensor · no sensor-safe claim on the current label.
Good for owners cleaning an older port-injected engine who are comfortable managing overspray around sensors, or anyone familiar with the Gunk M4712 wanting a compatible replacement. Skip it if you need documented O2-sensor-safe and cat-converter-safe chemistry, or if you need CARB compliance.
DANGER signal word. SDS §8 specifies an organic-vapor cartridge respirator with full facepiece · use outdoors or with the garage door fully open. H304 aspiration hazard: do not induce vomiting if swallowed. H336 narcosis and H373 repeated-exposure organ damage from vapor inhalation. Prop 65 warning for ethylbenzene (CAS 100-41-4) confirmed in SDS §15. No mixture-level aquatic hazard per SDS §12; keep spills off storm drains.
The label does not carry an explicit O2-sensor-safe or catalytic-converter-safe claim. SDS §3 shows xylene at 2.5·10% · aromatic content above the <5% threshold associated with confirmed sensor-safe throttle-body formulas. Use with caution around downstream sensors; a dedicated O2-sensor-safe formula is the lower-risk choice for modern EFI vehicles.
Stens 752-930 is marketed as a compatible replacement for Gunk M4712. The formula is believed to be equivalent based on the shared Amazon listing and the 'replacement for' positioning, and the SDS (issued by Blaster LLC for the Gunk M4712) applies to this product.
Yes. The SDS confirms ethylbenzene (a listed carcinogen, CAS 100-41-4) triggers a California Prop 65 warning. The warning appears on labels sold in California.
No. The SDS shows regulatory VOC >10% w/w (acetone-exempt accounting), but absolute solvent emissions are high · acetone at 60·80% delivers significant vapor load even though it is exempt from regulatory counting.
Marketing copy from Stens, via Amazon. Not editorial.
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