A Common Winter Mistake That Could Destroy Your Car's Engine Without You Realising

The science behind the issue is straightforward: water freezes at 0°C and boils at 100°C. Antifreeze, on the other hand, is formulated to lower the freezing point while raising the boiling point of the fluid, providing vital protection for the engine whether the car is cruising on the motorway or parked in freezing conditions.

Although water is an effective conductor of heat, its thermal properties are not built for the extreme demands of modern engines. Antifreeze delivers essential thermal stability and protects the system across all seasons.

Kilmer, whose YouTube channel boasts over 6.4 million subscribers, also warned drivers about the dangers of cavitation. He explains that the cooling system requires a balanced 50/50 mixture of water and antifreeze to stop air bubbles from forming in the liquid. These bubbles can severely erode and ruin internal metal components, and the protective additives that prevent this are only present in proper engine coolant.

To illustrate the potential damage, Kilmer highlighted the case of a Toyota owner. The previous keeper had filled the cooling system entirely with water, leaving the unsuspecting buyer to deal with catastrophic engine failure shortly after, reports N1info.ba. The expert strongly advises motorists never to run a vehicle if there is only water in the cooling system.

Industry specialists at BookMyGarage have echoed these warnings, reminding motorists of the importance of routinely monitoring their coolant mix. They point out that standard tap water contains minerals and limescale that cause severe long-term damage to engine components, recommending a strict 50:50 ratio of antifreeze to distilled water to avoid eye-watering repair bills.

Routine maintenance of the cooling system and regular fluid checks—particularly ahead of the winter season or when purchasing a used vehicle—remain vital to ensuring long-term reliability and engine health.