Long-term: Sludge accumulation blocking coolant flow and potential hydrolock. This mixture is highly effective at insulating metal surfaces, which leads to rapid overheating.
Sludge Buildup: Why Oil-Coolant Mixture Demands a Flush and How to Perform It
Faulty Transmission Cooler: In vehicles where the transmission cooler is integrated into the radiator, a ruptured internal tube can allow ATF to mix with the engine coolant. Overheating stresses the block and can cause minute cracks that worsen over time.
If this mixture is circulated through the engine block, it can clog the narrow coolant galleries, starving critical components like the cylinder heads of necessary lubrication and cooling. The repair involves replacing the head gasket and checking the flatness of the cylinder head and engine block surfaces.
Removing Sludge Buildup with an Effective Oil Coolant Flush
A careful driver might notice the milky, chocolate-like appearance of the coolant in the overflow reservoir, which is a clear indicator of contamination. Short-term: Overheating and warping of the cylinder head.
More About Oil in radiator coolant
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