Some Subaru Forester owners report experiencing head gasket oil leak issues that require replacement, which can manifest as external oil leaks, internal coolant leaks, or warped and cracked heads. Symptoms such as coolant mixing with engine oil or a milky white appearance on the oil dipstick may indicate a head gasket problem. Many owners find that head gasket leaks are a common occurrence in Subaru vehicles, particularly in models with the EJ253 engine, where external oil leaks may not be immediately noticeable. The average cost for head gasket replacement is reported to range from $2,000 to $4,000, with labor being a significant part of the expense, and additional parts like tensioners and seals potentially increasing overall costs. Some owners also consider preventive measures, such as replacing the rear main seal and cam seals during the head gasket replacement process. Additionally, Subaru has made design changes in later models, like the FB25 engine, to reduce the risk of oil and coolant mixing by altering the coolant flow through the head gasket.

The leak may develop from the oil pump seal. Our technicians prefer to use thread locker when replacing the seal to prevent the bolts from becoming loose again.