Engine Coolant Additives
Is engine coolant the same as antifreeze?
No. Though engine coolant and antifreeze serve the same purpose—to keep your engine from freezing up or overheating—they are not the same. Antifreeze is a concentrated glycol-based solution that must be diluted with water before use. Engine coolant is a 50/50 mixture of antifreeze and distilled water so no dilution is necessary.
Can I add water to my engine coolant?
Engine coolant is already pre-diluted with water, so no addition is necessary. Though a little bit of water added to the engine coolant won’t cause damage, adding too much will reduce its effectiveness.