What percentage of antifreeze is commonly recommended for use in engines?

The commonly recommended percentage of antifreeze for use in engines is typically around 30% to 50%, depending on the specific conditions and requirements of the engine system. A 30% antifreeze concentration strikes a balance between providing adequate freeze protection and preventing corrosion within the cooling system.

This concentration is effective in lowering the freezing point of the coolant while still allowing for sufficient heat transfer characteristics, which is critical for engine performance. Utilizing a concentration that is too low may lead to inadequate freeze protection, especially in colder climates. On the other hand, pushing the concentration too high can negatively affect thermal efficiency and also impair the fluidity of the coolant, potentially leading to cooling issues.

In certain situations, factors such as local climate extremes, engine type, and manufacturer specifications may call for adjustments to this concentration, but 30% is a widely accepted standard for a range of conditions.