Understanding the Antifreeze Reservoir and Its Role The antifreeze reservoir, often called the overflow tank or coolant expansion tank, is a vital component of a vehicle's cooling system. A crack in the engine block or cylinder head can create a direct tunnel between the oil galleries and the water jackets.
Coolant System Oil Leak Signs to Watch For
Located between the engine block and the cylinder head, this gasket seals the combustion chambers and the internal coolant and oil galleries. Blown Head Gasket The most common culprit for this mixture is a blown head gasket.
Drivers should be vigilant for a milky white substance on the dipstick, which shows the oil has been emulsified by the coolant, losing its lubricating properties. Cracked Engine Block or Cylinder Head Metal components can also fail due to extreme heat or physical stress.
Coolant System Oil Leak Signs to Watch For
What To Do Next If you suspect oil in the antifreeze reservoir, the vehicle should be stopped immediately and towed to a mechanic. Continuing to drive, even to the shop, can turn a relatively affordable repair—such as replacing a head gasket—into a total engine replacement.
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