A crack in the engine block or cylinder head can create a direct tunnel between the oil galleries and the water jackets. 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.
Pressure Test Cooling System to Detect Leaks and Contamination
Since the cooling system and the lubrication system are entirely separate circuits, their meeting point is usually a gasket or a seal. Consequences of Driving With Contaminated Coolant Ignoring this issue is not an option, as the consequences escalate quickly.
Located between the engine block and the cylinder head, this gasket seals the combustion chambers and the internal coolant and oil galleries. When these barriers fail, pressurized coolant can force its way into the oil passages, or vice versa, leading to the contamination visible in the reservoir.
Conducting a Cooling System Pressure Test to Find Leaks
What To Do Next If you suspect oil in the antifreeze reservoir, the vehicle should be stopped immediately and towed to a mechanic. Cracked Engine Block or Cylinder Head Metal components can also fail due to extreme heat or physical stress.
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