Ethanol Shield

Ethanol Shield is a product line from B3C Fuel Solutions LLC (Conway, SC), a small business specializing in fuel chemistry solutions for the ethanol era of pump gasoline. The brand's flagship product is its Ethanol Shield Fuel Stabilizer, formulated specifically to address phase separation, corrosion, and gum/varnish buildup caused by ethanol-blended fuels. B3C Fuel Solutions also produces Mechanic in a Bottle, a fuel system repair additive with a separate formulation and purpose.

The brand built its reputation partly through YouTube endorsements from the Chicanic channel, which compared Ethanol Shield against competitors in real-world water-absorption tests — a factor driving many of its Amazon reviews. The company is Made in USA and labels its product with ASTM and NACE corrosion rating claims.