STP 100% Antifreeze/Coolant Conventional Green 3.78L

STP 100% Antifreeze Conventional Green is a full-strength concentrated coolant that provides year-round protection for your vehicle's cooling system. This trusted formula from STP delivers reliable freeze protection in winter, boil-over protection in summer, and corrosion protection all year long.

Key Features & Benefits:

• 100% Concentrate - Full-strength formula must be mixed with water (typically 50/50) for optimal protection
• All Season Protection - Guards against freezing, boil-over, and corrosion year-round
• Conventional Green Formula - Traditional ethylene glycol-based coolant for older vehicles
• Corrosion Inhibitors - Protects engine, radiator, water pump, and all cooling system components
• Wide Temperature Range - Provides protection from -34°F to 265°F when properly mixed
• Trusted STP Quality - From the brand that's been protecting engines since 1954
• Cost-Effective - Concentrated formula makes 2 gallons when mixed 50/50 with distilled water
• 1 Gallon Bottle - Professional size for complete cooling system service