Summary:
While conspiracy theories claim gas stations have watered down gas, there’s no truth to this—intentionally adding water would damage vehicles and hurt business. However, gasoline does contain various additives that significantly impact engine performance and longevity.
Water can accidentally enter underground tanks through leaks or condensation, which can harm engines. But the real story lies in the additives mixed into modern fuel to enhance its quality and function.
Common Fuel Additives
- Ethanol: Widely used (up to 10%), it burns cleaner but lowers fuel efficiency and can damage older engines due to moisture absorption.
- Detergents: Clean engine parts like intake valves and injectors. Required in “Top Tier” fuels for improved performance and cleanliness.
- Corrosion Inhibitors: Help prevent rust in the fuel system, especially useful in humid conditions or infrequently used vehicles.
- Octane Boosters: Enhance performance and prevent engine knocking, but some additives like MMT may harm spark plugs and sensors.
- Lubricants: Protect rubber and plastic parts from drying out, especially in ethanol-rich fuel blends.
- Fuel Stabilizers: Extend fuel life during storage, beneficial for boats or seasonal vehicles.
- Demulsifiers: Separate water from fuel to avoid engine issues from water contamination.
- Fragrance Additives: Rare, used mainly in racing fuels for scent, with little performance impact.
- Cold Flow Additives: Keep diesel fuel fluid in freezing temperatures.
- Dyes: Used to identify off-road diesel; they don’t affect performance.
Fuel Quality by Brand
“Top Tier” fuel brands like Shell, Chevron, Costco, and ExxonMobil include higher-quality additives for better performance. Budget stations meet legal requirements but may lack the added benefits. High-performance vehicles benefit most from premium, well-treated fuel.
Ultimately, understanding what’s in your gas tank helps extend your engine’s life and optimize your car’s performance.
Family Handyman
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