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Prices may varyAbout 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 SDS data — they do not replace the SDS or substitute for a hazard assessment specific to your task.
CarCareTruth's Analysis
Last reviewed May 20, 2026
TL;DR PEA-class chemistry targets injectors and intake valves — zones backed by the SDS §3 active — but the brand's combustion chamber claim goes beyond what that chemistry class independently delivers. DANGER signal word from aspiration hazard (H304). Safety goggles are warranted for the pour step; the SDS §15 Prop 65 warning covers multiple aromatic solvent components.
What it is and how it performs
Gasoline Extreme uses PEA-based detergent chemistry at a concentration the brand markets as professional-grade. The SDS §3 active class credibly covers zone 1 (tank, lines, injectors) and zone 2 (intake manifold and valves); the brand also claims combustion chamber cleaning (zone 3), but that zone exceeds what PEA chemistry alone delivers. Treatment is 12 oz per 20 gallons, at fill-up or every 10,000 miles. Community data (4.6 stars / 603 Amazon reviews) supports the injector and intake cleaning function — no independent SAE paper for this formulation was found.
Who should buy this — and who should skip it
Best for gasoline engine owners running non-Top Tier fuel who suspect injector and intake valve carbon buildup — PEA chemistry is the right active class for that scenario. Drivers who consistently use Top Tier gasoline already receive a deposit-prevention detergent package. For misfires or rough idle beyond typical carbon fouling, professional ultrasonic injector service is the right call. Diesel owners: this is formulated for gasoline only.
Safety and environmental impact
SDS §2 classifies this mixture with a DANGER signal word, driven by H304 aspiration hazard. The SDS §4 first-aid guidance states vomiting must not be induced if ingested. Safety goggles are warranted for the pour step; H335 respiratory irritation from concentrate vapor is the inhalation concern. The product combusts in the engine — exhaust byproducts are the environmental endpoint, not wastewater.
Frequently asked questions
How much Gasoline Extreme should I use per tank?▾
The label specifies 12 oz for every 20 gallons of gasoline. The 16 oz bottle is sized as a one-tank treatment at that rate. Pour directly into the fuel tank at fill-up or every 10,000 miles.
Is Gasoline Extreme compatible with GDI (direct injection) engines?▾
The product page and label do not specifically address GDI engines. PEA-class chemistry is well-studied for intake valve carbon deposits in GDI engines — port injection does not rinse GDI intake valves, making PEA particularly relevant for that application. However, the brand has not published GDI-specific dosing guidance or test data for this formula.
Does Gasoline Extreme clean the combustion chamber?▾
The brand claims combustion chamber cleaning on the product label. PEA chemistry credibly addresses injectors and intake valves; combustion chamber carbon at high temperatures is a harder target for PEA alone. No independent test data confirming combustion chamber cleaning with this specific formulation was found.
Why does Gasoline Extreme carry a Prop 65 warning?▾
SDS §15 lists multiple aromatic solvent components — including cumene, ethylbenzene, naphthalene, toluene, benzene, and others — as California Prop 65-listed substances for cancer and/or reproductive harm. These are present as minor fractions of the carrier solvent system. The product is currently listed as out of stock on Amazon.
Is Gasoline Extreme safe for catalytic converters and oxygen sensors?▾
The brand does not publish explicit compatibility statements for catalytic converters or oxygen sensors on the product page or label reviewed. No community-reported compatibility failures were found in the Amazon review corpus (603 reviews). PEA-class chemistry is generally regarded as catalyst-safe at normal fuel additive concentrations.
From the manufacturer
Marketing copy from Hot Shot's Secret, via Amazon. Not editorial.
- •CLEANS FUEL STYSTEM: Hot Shot’s Secret Gasoline Extreme is designed to thoroughly clean, lubricate, and safeguard all components of a gasoline engine & fuel system, such as valves, pumps, injectors, rings, pistons, and upper cylinders.
- •BOOSTS FUEL ECONOMY: By thoroughly cleaning the fuel system, this fuel additive boosts MPG up to 7.9%, ensures combustion efficiency, & engine power, resulting in a smoother & more efficient driving experience.
- •FIXES ISSUES: This fuel treatment addresses common issues associated with rough-running engines in a single treatment. Designed to improve fuel economy, smooth out idling, & unclog fuel injectors, this will have your engine running great again!
- •RESTORES PERFORMANCE: High-performance cleaner that utilizes P.E.A. technology to deeply clean & restore engine power, dissolve gum & varnish buildup, removes deposits from the combustion chamber, resulting in improved overall engine performance.
- •EASY TO USE: With a simple application of 12 oz. for every 20 gallons of gasoline, this product is easy to use! Just pour it into your fuel tank during your next fill up or every 10,000 miles
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Manufacturer images
Manufacturer specifications
- Brand
- Hot Shot's Secret
- Item Volume
- 16 Fluid Ounces
- Unit Count
- 16.0 Fluid Ounces
- Number of Items
- 1
- Contains Liquid Contents
- Yes
- Contains Liquid Contents?
- Yes
- Container Type
- Bottle
- Brand Name
- Hot Shot's Secret
- Manufacturer
- Hot Shot's Secret
- UPC
- 731717962106
- Model Number
- GE16Z
- Part Number
- GE16Z
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