CarCareTruth Score
Decent, but it's tough on the environment.
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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
“No H318 or H319 in SDS §2 mixture-level classification. Aromatic solvent carriers (light aromatic naphtha, 1,2,4-trimethylbenzene) present at 5-15% combined. Drip-back from a narrow fuel-tank fill neck makes eye contact from splash a realistic risk during the pour step.”
— CRC
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
“H315 (skin irritation Cat 2) in SDS §2. Brief drip contact during the pour step is the primary exposure scenario. SDS §8 specifies nitrile, neoprene, or PVC gloves for prolonged contact.”
— CRC
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
“H332 (harmful if inhaled, Cat 4) in SDS §2 mixture-level classification. Cat 4 inhalation hazard maps to recommended tier; H331 (Cat 3 toxic) is not present. Flash point 79.4°C means the carrier is volatile. SDS §7 instructs 'use only outdoors or in a well-ventilated area.'”
— CRC
U.S. regulatory standard
29 CFR 1910.134(a); 1910.1200(f)
“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.
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 #4 of 10 in Fuel System Cleaner.Three above it ↓
Last reviewed July 4, 2026
TL;DR CRC Guaranteed to Pass uses a dual-detergent package the brand claims covers injectors, intake valves, and combustion chambers. Active concentrations are trade-secret; multi-zone coverage relies on brand positioning. Community evidence on emissions reduction is broadly positive. DANGER signal word and Prop 65 warning apply.
A fuel-tank pour-in cleaner built on a Mannich-base alkyl phenol amine plus an alkaryl polyether co-active. Together they target carbon and varnish deposits through the fuel delivery path. The brand claims injector, intake valve, and combustion chamber coverage, and those claims are consistent with the detergent chemistry class, but concentrations are not publicly disclosed. The 5-step pre-test protocol is clear: treat a half-full gasoline tank, drive 20-40 miles, fill up, drive to near-empty, then test. Also works as a maintenance treatment every 3,000 miles.
Best for gasoline vehicle owners ahead of an emissions test who have not run Top Tier certified fuel consistently. The structured protocol and money-back guarantee reduce risk. Skip if you consistently use Top Tier fuel, since its detergent package already prevents buildup. Skip if the check engine light reflects a mechanically failed catalytic converter or sensor; a fuel additive will not fix those. Not for diesel engines.
DANGER from H304 (aspiration hazard): do not induce vomiting if ingested, seek medical attention. H332 (harmful if inhaled) at mixture level; use outdoors or in a well-ventilated area during the pour step. Prop 65 warning for aromatic solvent components. The product combusts in the engine; exhaust byproducts are the environmental endpoint.
Community results are mixed but leaning positive. Many owners report passing after using the product with the full 5-step protocol (half-tank treatment, 20-40 mile drive, fill up, drive to near-empty, then test). The double money-back guarantee from CRC Industries applies if you follow the directions and your car fails. Severely fouled catalytic converters or pre-existing mechanical issues will not be resolved by a fuel additive.
The brand states the product can help with P0420 and P0430 codes plus related fuel trim codes (see crcg2p.com for details). These catalyst efficiency codes sometimes result from carbon fouling that a detergent treatment can address; other times they indicate actual catalyst failure. Community results are split. If the code returns after the drive cycle, the catalytic converter may need professional evaluation.
Yes. The manufacturer listing confirms the product is safe for all gasoline engines including Direct Injection (GDI) and Port Injection (PI), with or without turbochargers or superchargers.
No. The label states explicitly: 'NOT FOR USE IN DIESEL ENGINES.' This product is formulated for gasoline engines only, including those running ethanol blends.
The label recommends using it four times per year (every 3,000 miles or so) for ongoing fuel system maintenance. For a pre-emissions-test flush, use the 5-step protocol: add to a half-full tank, drive 20-40 miles, fill up, drive down to about 1/8 tank, then refill and go to the test.
Marketing copy from CRC, via Amazon. Not editorial.
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