STP Heavy-Duty Nitrite-Free Extended Life Antifreeze/Coolant Ready-To-Use is formulated to protect against winter freezing and summer boil over.
- Prevents pitting caused by cavitation and corrosion of brass, copper, solder, steel, cast iron and aluminum
- Extended service life: up to 1,000,000 miles or 20,000 hours protection
- Free of phosphates, silicate, nitrites, amines and borates
- Compatible with most major OEM brands of extended life coolants