New CRC PHASEGUARD4  provides the maximum protection available for E10 to E85 fuel and helps prevent phase separation — the number one cause of ethanol fuel related problems. This harmful “phase separation” of the fuel can lead to severe corrosion, decreased fuel economy and engine performance, rough starts and hesitation. CRC PHASEGUARD4 prevents phase separation with the 4-in-1 formula that protects against corrosion, cleans the entire fuel system, stabilizes fuel for daily use as well as long-term storage and restores power and mileage potential. Developed to work with all gas-powered 2- and 4-stroke engines and is effective in E10 to E85 fuels. One ounce of PHASEGUARD4 treats 10 gallons of fuel. PHASEGUARD4 stabilizes stored fuel for a minimum of 12 months. Offered in 8 ounce, 16 ounce and 32 ounce sizes.