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.
This product ranks #3 of 10 in Fuel System Cleaner.
Last reviewed July 5, 2026
TL;DR A diesel-only cleaner pairing an injector-detergent package with a cetane improver, so it cleans injectors and aids combustion in one tankful. The exact detergent chemistry isn't disclosed and there's no diesel-specific test, but Techron has a strong track record. Health 5.0 (Hazardous): DANGER from an aspiration hazard, so if swallowed, do not induce vomiting.
Techron D combines a diesel injector-detergent package with a cetane improver that decomposes during combustion to shorten ignition delay; the brand credits this with restoring cetane, cutting emissions, and improving cold starts. The primary cleaning detergent isn't named in the US SDS, so the injector-cleaning claim rests partly on Chevron's positioning, though the cetane mechanism is real and diesel-specific. It works as a one-time flush or periodic maintenance: one 20 oz bottle treats 35 gallons.
Best for diesel owners wanting a single-bottle cleanup with a cetane bump; it's labeled for all diesel types including ultra-low-sulfur diesel, biodiesel blends, and both older and common-rail engines. Skip it if you run a gasoline engine; this is diesel-only, and Chevron sells a separate gasoline Techron. Skip it for injector failure or fouling beyond typical carbon, where professional service is the right call.
The SDS is DANGER, driven by H304 (aspiration toxicant: the hazard is swallowed liquid entering the lungs, not skin, eye, or vapor contact) and H227 (combustible liquid). No skin, eye, or respiratory H-codes appear at mixture level, so no PPE axis is required for the brief pour, though a volatile carrier warrants ventilation in an enclosed garage. Do not induce vomiting if ingested; seek medical attention. The concentrate is very toxic to aquatic life; in use it combusts, so exhaust byproducts are the environmental endpoint.
The product description states it is designed for all types and sizes of diesel engines, including older engines and the latest common-rail direct-injection diesels. It is labeled for all types of diesel fuel, including ultra-low-sulfur diesel, biodiesel, and biodiesel blends. It is for diesel engines only · do not use it in a gasoline engine (the gasoline counterpart is Techron Concentrate Plus).
The DANGER classification comes from H304 (aspiration toxicant) and H227 (combustible liquid). H304 means the specific hazard is liquid being drawn into the lungs if the product is swallowed · not a hazard from normal handling, skin contact, or inhaling vapor during the pour. No skin, eye, or respiratory irritation H-codes appear at the mixture level in the SDS. The practical rule: if swallowed, do not induce vomiting · call a poison center or physician.
One 20 oz bottle treats up to 35 gallons of diesel fuel per the product description. The brand states it is safe to use every 3,000 miles or at every oil change. Pour the full bottle into a nearly empty tank, then refuel · it works as a one-time flush when deposits are suspected or as periodic maintenance.
Yes. The formula includes 2-ethylhexyl nitrate, a cetane improver that decomposes during combustion to shorten ignition delay. The brand states this helps restore cetane, improving combustion for reduced emissions and better cold starting. This is a real diesel-specific mechanism, distinct from the injector-detergent action.
No. The SDS classifies the concentrate as very toxic to aquatic life with long-lasting effects (H410), and the material is not expected to be readily biodegradable. Collect any spillage and avoid release to the environment. In normal use the product is combusted in the engine, so exhaust byproducts · not wastewater · are the environmental endpoint.
Marketing copy from Chevron, via Amazon. Not editorial.
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