Inspect the coolant reservoir for a thin film or swirling oil patterns. Common Causes of Contamination The most frequent culprit behind oil in the coolant is a failed internal gasket or seal.
Step-by-Step Coolant Oil Contamination Fix Guide
Examine the transmission fluid level for signs of cross-contamination if the cooler is the source. When these seals fail due to age, overheating, or improper installation, pressurized combustion gases or oil can be forced into the coolant passages.
Regardless of the source, simply draining and refilling the fluids is not a solution; the underlying mechanical failure must be fixed, and all old, contaminated fluids must be completely flushed and replaced with new specifications to ensure the longevity of the repair. Addressing this issue promptly is critical, as continuing to drive with contaminated coolant can lead to catastrophic and expensive engine damage.
Step-by-Step Guide to Fixing Coolant Oil Contamination
Use a combustion leak test kit to verify if hydrocarbons are present in the coolant. While the repair costs—ranging from a few hundred dollars for a gasket to over a thousand for a radiator replacement—may seem significant, they are trivial compared to the cost of rebuilding or replacing an engine destroyed by overheating.
More About Oil in the coolant reservoir
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