Case contains twelve 16 ounce (1 pint) bottles of Stanadyne Diesel Fuel Additive Performance Formula. Each will treat 30 gallons of fuel. Each bottle has measurement markings to treat 15 gallons of fuel at a time. Stanadyne's brand boasts the following: more power and performance, improved cetane, and lubrication. It also cleans and protects your engine, while providing cold weather protection. It is compatible with ULSD and B20 and it can increase overall fuel economy. Stanadyne meets all diesel system requirements.