The plus makes the difference. In addition to standard deposits, ACDelco Fuel System Treatment Plus helps counteract corrosive elements (sulfur, water, etc.) in the fuel that can cause serious damage to fuel-system electronics.
PROPOSITION 65 WARNING: Battery posts, terminals and related accessories contain Lead and Lead components, chemicals known to the state of California to cause birth defects and other reproductive harm. Batteries also contain other chemicals known to the state of California to cause cancer. WASH HANDS AFTER HANDLING.