Gunk Original Engine Brite Heavy Duty Engine Degreaser
Priced as of May 14, 2026
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Prices may varyFrom the Safety Data Sheet
Full SDS ↗ (rev. 2023-02-21)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.
EyesRequiredMfr. SDS §8 · 29 CFR 1910.133(a)(1) · GHS H319SkinRequiredMfr. SDS §8 · 29 CFR 1910.138(a) · GHS H315LungsRequiredMfr. SDS §8 · 29 CFR 1910.1000 · GHS H351Ventilation—No PPE in published sourcesShow details for all categories ▾Hide details ▴
From the manufacturer’s Safety Data Sheet, Section 8
“SDS §8 directs splash goggles for H319 (serious eye irritation, Cat 2A). The aerosol form factor concentrates mist at face height during engine-bay overhead spraying — the same chemistry that classifies as a Cat 2A irritant in §2 is what reaches the eye in this exposure scenario.”
— Gunk
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 §8 directs chemical-resistant gloves for H315 (skin irritation Cat 2). The petroleum-distillate solvent base also carries an ACGIH skin designation for aliphatic distillate, kerosene, heavy-aromatic naphtha, and naphthalene — meaning dermal absorption is a documented exposure pathway for this chemistry independent of the irritation classification.”
— Gunk
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
“SDS §8 directs an organic-vapor cartridge respirator when adequate ventilation cannot be achieved. The combination of H336 (narcotic-class CNS depression, Cat 3), H304 (aspiration hazard, Cat 1), 98% volatile content, and aerosol-mist droplet size puts respiratory exposure well above the threshold for required lung protection. The aerosol form factor applies a ×1.5 modifier on the lung-PPE deduction per the engine-degreaser rubric.”
— Gunk
U.S. regulatory standard
29 CFR 1910.1000; 1910.1200
“Each employer shall assure that no employee is exposed [in excess of the PEL]…”
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 A pressurized petroleum-solvent aerosol that strips baked-on grease in a single 5–15 minute dwell. DANGER chemistry (suspected carcinogen Cat 2, aspiration hazard, narcotic-class inhalation hazard) and a real California Prop 65 warning. Splash goggles, chemical-resistant gloves, and an organic-vapor cartridge respirator are what the SDS and aerosol form factor require.
What it is and how it performs
A heavy-duty solvent-based degreaser in a 15 oz pressurized aerosol — no dilution option. The classic mechanic-grade product, recognized in the trade for roughly 75 years. Spray on a cool engine, dwell 5–15 minutes, brush-agitate worst deposits, rinse with a garden hose. Community evidence across r/AutoDetailing, r/MechanicAdvice, and the long-running ChevyTalk and FordTrucksDotCom threads confirms strong performance on neglected engine bays. Trade-offs: solvent residue often needs a towel wipe after rinse, and the heavy-aromatic content flags caution on modern composite engine covers and exposed rubber. Older bare-metal engine bays handle it fine. Not CARB-compliant — Gunk sells a California-reformulated EB1CA variant for that market.
Who should buy this — and who should skip it
The right call for a neglected engine bay on an older vehicle with mostly metal under the hood and a buyer willing to gear up outdoors. Skip it if the engine bay has a modern plastic intake-manifold cover or exposed rubber — a milder alkaline biodegradable degreaser is the lower-risk choice. California buyers should choose EB1CA.
Safety and environmental impact
DANGER signal word with eight health-tier hazard codes — aspiration hazard, suspected carcinogen Cat 2, repeated-exposure target-organ toxicity, narcotic-class CNS depression, plus skin and eye irritation. The Prop 65 warning is driven by naphthalene at <1% as a trace impurity in the heavy-aromatic naphtha cut. The CO2 propellant adds a gas-under-pressure classification — do not pierce or burn the can, do not spray near open flame. Environmentally this is a drain-destined solvent: rinse runoff carries petroleum-distillate solvent toward storm drains. The mixture is not classified environmentally hazardous at §12, but ingredient-level aquatic toxicity is real and the formula is not biodegradable.
Frequently asked questions
Is Gunk Original Engine Brite safe to use in California?▾
No — the EB1 formula does not meet California CARB consumer-product VOC limits. The Prop 65 warning on the can names naphthalene as the listed-cancer chemical, and the SDS confirms the formula's roughly 700 g/L absolute VOC exceeds CARB caps. Gunk sells a separate California-reformulated SKU (EB1CA, ASIN B0057HXI6Y) with a lower-VOC formula for California buyers.
Why does this product require a respirator when other engine degreasers only suggest one?▾
Two chemistry factors stack: H336 (narcotic-class CNS depression from heavy-aromatic naphtha) and H304 (aspiration hazard from petroleum-distillate aliphatic). The SDS §9 percent-volatile figure is 98%, meaning almost everything in the can leaves the surface as vapor or mist. Pressurized-aerosol droplet size is finer than pump-spray, which carries vapor deeper into the airway. SDS §8 directs an organic-vapor cartridge respirator when adequate ventilation cannot be achieved — required, not boilerplate.
Will this damage plastic or rubber engine-bay components?▾
Community evidence flags caution on modern composite engine covers, decorative plastic shrouds, and exposed rubber hoses. The heavy-aromatic naphtha fraction (3–<5% in SDS §3) is the specific solvent class that aggressively attacks rubber and softens some plastics. Older bare-metal engine bays handle the chemistry without issue. For a modern engine bay with a plastic intake manifold cover and decorative shrouds, a milder alkaline degreaser is the lower-risk choice.
Is the Prop 65 warning on the can a real concern or just California-label boilerplate?▾
It is real chemistry. SDS §15 explicitly names naphthalene (CAS 91-20-3) as the Prop 65 listed substance present in the formula. Naphthalene was added to the Prop 65 list in 2002 as a cancer-endpoint chemical and is documented in SDS §3 at <1% as a trace impurity from the heavy-aromatic naphtha cut. The warning is not generic California-label coverage — it points to a specific substance in the can.
Can it be used on a cold engine?▾
Yes — and it should be. The label and SDS §7 direct application to a cool engine. Spraying on a hot engine accelerates solvent evaporation, increases inhalation exposure, and introduces ignition risk against hot exhaust components — the flash point is 57.8 °C (136 °F), low enough that hot engine surfaces become an ignition source for the mist.
From the manufacturer
Marketing copy from Gunk, via Amazon. Not editorial.
- •Effective Cleaning Action – GUNK Engine Degreaser is designed to remove tough oil and grease buildup. Its formula clings to engine surfaces, making grime easier to lift without extra scrubbing.
- •Quickly Removes Grease and Oil – This degreaser spray works on engines with stubborn buildup or leaks, loosening dirt, oil, and grease so it rinses away easily and keeps your engine cleaner.
- •Consistent Results – GUNK Engine Degreaser provides reliable cleaning for everyday maintenance, helping your engine look well-kept without affecting delicate engine parts.
- •Reaches Hard-to-Clean Areas – The spray covers engine surfaces, including corners and tight spots, breaking down tough grease and oil for a deep clean.
- •Easy Rinse-Off – Once applied, this degreaser spray rinses away quickly with water, leaving your engine refreshed and ready for inspection or routine maintenance.
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Manufacturer videos
Manufacturer images
Manufacturer specifications
- Is Discontinued By Manufacturer
- No
- Product Dimensions
- 11 x 8.3 x 10 inches; 1.15 Pounds
- Item model number
- EB1-12PK
- Date First Available
- February 15, 2013
- Manufacturer
- Gunk
- ASIN
- B00BGSF6XQ
- Best Sellers Rank
- See Top 100 in Automotive
- Item Form
- Aerosol
- Scent
- Unscented
- Specific Uses For Product
- Engine
- Surface Recommendation
- Metal
- Contains Liquid Contents?
- Yes
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Top Amazon review
↗External — Amazon's most-helpful review for context.
Good product
Been using it for years. Leaves surfaces clean and oil free.