CarCareTruth Score
Decent, but it's tough on the environment.
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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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Only when: handling concentrate · splash risk
Translated from the manufacturer’s Safety Data Sheet, Section 8
SDS §8 (rev 2026-05-07): 'Eye protection: Safety glasses.' No H318/H319 eye-damage H-code applies at mixture level (§11: serious eye damage/irritation not classified), so this is a cautious-precaution row for the pour/transfer step, not a mixture-hazard escalation.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
Only when: handling concentrate · splash risk
Translated from the manufacturer’s Safety Data Sheet, Section 8
SDS §8 (rev 2026-05-07): 'Hand protection: Protective gloves' and 'Skin and body protection: Wear suitable protective clothing.' No H314/H315/H317 skin H-code applies at mixture level, so this covers splash exposure while pouring/handling the undiluted concentrate.
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 8
SDS §8 (rev 2026-05-07): 'Respiratory protection: In case of insufficient ventilation, wear suitable respiratory equipment.' Generic ventilation boilerplate · no H330/H331/H334/H335 inhalation H-code at mixture level, and the flash point (232°C) means negligible vapor at ambient temperature. Applies only if dosing in an unventilated enclosed space.
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.
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 #13 of 16 in Fuel Injector Cleaner.Three above it ↓
Last reviewed June 9, 2026
TL;DR The active detergent ingredient is not disclosed on the label or brand site, so there is no independent basis for evaluating the cleaning claim. It is highly rated on Amazon by a large owner base, a genuine track record, but the enthusiast community has never reached consensus on what the chemistry actually does.
Lucas markets this as a fuel system treatment and upper cylinder lubricant for gasoline and diesel engines. The SDS lists only a hydrotreated petroleum distillate carrier; the detergent package is withheld as a trade secret, so there is no basis for comparing the cleaning mechanism to named-active alternatives. The brand states the product cleans injectors and neutralizes sulfur; no SAE papers or third-party tests corroborate those claims for this specific product. Dosing: 2-3 oz per 10 gallons every 3,000 miles.
Best for owners on non-Top Tier fuel in older port-injection or diesel engines who want low-cost maintenance and are comfortable with an undisclosed active. Skip it if you consistently run Top Tier gasoline (the OEM detergent package already covers this), if you need confirmed PEA chemistry for a GDI engine with carbon buildup concerns, or if severe fouling symptoms are present; at that point professional ultrasonic cleaning is the right call, not a one-bottle treatment.
The SDS classifies the mixture as Aquatic Chronic Category 4 (H413, "may cause long lasting harmful effects to aquatic life") · a category with no signal word and no pictogram. The petroleum distillate carrier (flash point 232°C) produces negligible vapor at ambient temperature, so the brief pour step carries no meaningful inhalation or contact risk from the chemistry. The product listing carries a Prop 65 warning; SDS §15 names no specific Prop 65 chemical. The product combusts in the engine, so exhaust byproducts are the environmental endpoint.
The listing for Lucas Oil Fuel Treatment carries a California Prop 65 warning. Lucas Oil Fuel Treatment is a working automotive fluid rather than a passive part, so the warning points at the formulation itself. The manufacturer's Safety Data Sheet is the primary source for what is in it: the hazard classification and the PPE tiers on this page are translated from that sheet, and the full SDS is linked from the safety panel. California requires the warning whenever exposure to any of roughly 900 listed substances is possible. It does not name which substance applies to a given product, and it states no dose or risk level, so it is not on its own a measure of how hazardous this fluid is in normal use.
Marketing copy from Lucas Oil, via Amazon. Not editorial.
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