CarCareTruth Score
Decent, but wear gloves and ventilate.
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Prices may varyHealth 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
“SDS §2 classifies the concentrate as an eye irritant (Category 2B) and §9 reports a strongly alkaline pH of 12.4. A strongly alkaline liquid causes chemical eye burns on splash contact, and alkaline splashes are among the most damaging eye injuries, so eye protection is not optional, particularly for overhead engine-bay spray where mist reaches eye level.”
— Oil Eater
U.S. regulatory standard
29 CFR 1910.133(a)(1)
“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 the concentrate as a skin irritant (Category 2, H315). Chemical-resistant gloves are warranted for prolonged contact during agitation, though the chemistry falls short of the corrosive classification that would force gloves outright.”
— Oil Eater
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
“There is no respiratory H-code at mixture level and the working-dilution VOC is very low (about 4.6 g/L at 10:1), so the water-based formula has no meaningful inhalation pathway in normal outdoor use. The enclosed_space trigger captures engine-bay spray in a closed garage, where mist can accumulate.”
— Oil Eater
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
No PPE specified in published sources for ventilation. Absence does not imply “not needed” — consult the full Safety Data Sheet.
PPE tiers translate the manufacturer’s SDS and U.S. regulatory standards. Not professional safety advice. How we report safety.
This product ranks #6 of 11 in Engine Degreaser.Three above it ↓
Last reviewed July 6, 2026
TL;DR Oil Eater Original is a water-based, biodegradable concentrate that dilutes 10:1 for engine bays, wheels, and parts and 30:1 for lighter jobs, so one gallon stretches a long way. It cuts fresh and moderate grease, oil, and road grime well, but years of baked-on buildup usually need dwell time and brush agitation rather than a single spray-and-rinse. There is no petroleum solvent and no corrosion code, yet the concentrate is strongly alkaline (pH 12.4) and classifies as an eye and skin irritant, so eye protection is a real call and gloves are sensible for longer jobs. The listing also carries a California Proposition 65 warning the SDS does not clear.
This is a concentrate you dilute, not a ready-to-use spray. At the label's 10:1 ratio it lifts grease, oil, and road grime from engine bays, wheels, parts, and driveways; heavier, oil-caked buildup benefits from a few minutes of dwell, some brush agitation, and occasionally a second pass. Being water-based with no petroleum solvents, it rinses cleanly with little residue. Its real strengths are flexibility and value: two dilution ratios and strong per-gallon cost make it a versatile do-it-all cleaner. The main caveat is surface safety: at concentrate pH it is strongly alkaline, so the label warns to work on a cool surface and rinse promptly from warm aluminum and painted or coated surfaces.
The right pick for someone who wants one affordable, dilutable concentrate for engine bays, wheels, parts washing, and general grime, and does not mind mixing to the job. Owners facing years of baked-on buildup who want a one-pass strip may prefer a heavier solvent-based degreaser, and anyone working on bare aluminum or delicate finishes should rinse promptly and spot-test first given the alkaline pH.
The SDS carries a WARNING signal word and classifies the concentrate as an eye and skin irritant, with a single GHS07 pictogram. There is no corrosion or acute-toxicity code, but SDS §9 reports a strongly alkaline pH of 12.4, so the liquid can cause chemical eye burns on splash contact and irritate skin; eye protection is not optional for overhead engine-bay spray, and chemical-resistant gloves make sense for prolonged contact. The SDS lists no respiratory hazard and working-dilution VOC is very low, so no respirator is called for; still, use it outdoors or in a well-ventilated garage. The listing carries a California Proposition 65 warning the SDS does not clear, so the health score treats that signal at face value. Environmentally it is water-based, described as inherently biodegradable, and reported non-toxic to aquatic organisms; even so, engine-bay rinse water carries dissolved oil toward storm drains, so keep runoff away from them.
The label lists 10:1 (ten parts water to one part concentrate) for heavier soils, including engines, wheels, and parts washing. Step up to a stronger mix for baked-on deposits or dilute toward the 30:1 ratio for lighter grime on less porous surfaces. Because it is a concentrate, a single gallon stretches a long way at these ratios, which is a big part of its per-ounce value versus a ready-to-use spray.
It is water-based with no petroleum solvents, which are the usual cause of rubber swelling, so hoses and plastic connectors generally tolerate it at the diluted working ratios. The main caution is its alkaline pH of 12.4: the label warns that discoloration can occur on warm or hot aluminum and advises rinsing promptly from any aluminum, painted, or coated surface. Work on a cool surface, spot-test finished covers, and avoid long dwell on bare aluminum.
The Amazon listing shows a California Proposition 65 warning, but the safety data sheet's regulatory section is silent on Prop 65 and names no listed substance. Because the listing carries the warning and the SDS does not affirmatively clear it, the health score treats the signal at face value rather than assuming it away. That is separate from the SDS §2 classification, which is a workplace hazard rule and is where the non-corrosive, eye-and-skin-irritant call comes from.
It cuts fresh and moderate grease, oil, and road grime well, and owners rate it highly on Amazon for parts, wheels, and driveway stains. On years of caked-on engine buildup it typically needs dwell time and brush agitation, and sometimes a second application, rather than a single spray-and-rinse. It is best understood as a strong-value all-purpose degreaser rather than a solvent-strength one-pass stripper.
Marketing copy from Oil Eater, via Amazon. Not editorial.
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