Honda Civic engine oil mixing with coolant due to head gasket leak on Honda Civic

Submitted by fixerupper 150 · Jun 23, 2025
Published by RepairPal

Problem overview

Some Honda Civic owners report experiencing issues with oil and coolant mixing, often attributed to a head gasket leak. Common symptoms include a milky appearance on the dipstick, indicating coolant contamination in the oil. The average cost for head gasket replacement ranges from $1,724 to $2,013, and if left unresolved, a head gasket leak can lead to serious engine damage and performance problems. To remedy this situation, the head gasket must be replaced to stop the mixing of fluids. It is crucial for owners to address head gasket issues promptly to prevent further engine damage and complications, and seeking diagnosis and repair from a qualified mechanic is highly recommended.

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Honda Civic vehicles with this problem

1 model year affected
Average mileage: 226,000 miles
(226,000 - 226,000)

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