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HEET® brand contains a special fuel additive and methanol. When HEET® brand is added to the gas tank, it sinks to the bottom and mixes with any water. Since both HEET® brand and water are heavier than gasoline, they go to the bottom of the gas tank. HEET® brand absorbs water and keeps it from freezing, and blocking the flow of gasoline through the gas line and fuel pump. When the vehicle is started, the additives, methanol, water, and gasoline are consumed during combustion inside the engine.
ISO-HEET® brand contains isopropanol and special gas additives including Fuel Injector Cleaner. When ISO-HEET® brand is added to the fuel tank, this formula remains in the solution with the gasoline, and absorbs five times more than regular gas-line antifreeze. Any water in the gas tank mixes with the ISO-HEET® brand, preventing the water from freezing in winter. ISO-HEET® brand also removes water and condensation in warm, wet weather. Then the entire mixture of gasoline, ISO-HEET® brand and water are burned during combustion inside the engine. ISO-HEET® brand cleans fuel injectors and carburetors for fast starts and smooth-running engines year round.
No, only use HEET® brand (in the yellow bottle) in 4-cycle gasoline engines. However, ISO-HEET® brand (in the red bottle) can be used in any type of internal combustion engine (2 cycle, 4 cycle and diesel).
No. HEET® brand and ISO-HEET® brand are completely safe on catalytic converters and fuel injectors. ISO-HEET® brand will also safely clean the fuel injectors.
No, HEET® brand will not harm your carburetor or fuel system when used as directed.
Maybe, but not always, it depends where the gas line is frozen. You can try adding a bottle of HEET® brand, waiting 15-20 minutes and then trying starting your engine. If that does not work, you should have your car moved to a warm garage to thaw out. To avoid this from happening, you should always use HEET® brand as a preventative measure before temperatures are expected to fall below 32°F (0 °C).
One bottle of HEET® brand or ISO-HEET® brand treats up to 20 gallons (75.7 L) of gasoline. You should not use more than 2 bottles in a 20-gallon (75.7 L) gas tank, 3 bottles in a 30-gallon (113.6 L) gas tank. HEET® brand and ISO-HEET® brand are safe to use in every tankful, in all seasons, all year-round.
Either way – adding HEET® brand before or after you fill your tank with gasoline works equally well.
HEET® brand products do not expire. Unopened bottles of HEET® brand and ISO-HEET® brand have an indefinite shelf life provided the foil safety seal has not been broken. During storage, the bottles may swell and appear pressurized. This distortion is a result of vapor pressure formed by the formula stored at higher temperatures (which can happen in your garage or the trunk of your car). When this happens, the product is still fine to use. It does not diminish the product’s performance.
ISO-HEET® Brand (red) is a premium water remover and injector cleaner that can be used all year-round and can be used in all types of gasoline, 2-cycle mix and DIESEL. HEET® (yellow) is designed to prevent and treat freezing gas lines and remove some water. HEET® Brand (yellow) is NOT recommended for 2-cycle mix or DIESEL.
Typically, HEET® Brand starts acting immediately upon treating. For best results, it is recommended to allow 10-20 minutes if lines are completely frozen before starting vehicle.