Subaru Legacy head gasket and thermostat housing bolts broken, leaking oil and coolant on Subaru Legacy

Some Subaru Legacy owners report experiencing issues related to a broken head gasket, including oil mixing with coolant, which can lead to overheating and white smoke from the exhaust. Symptoms of a blown head gasket often include loss of coolant and oil present in the coolant reservoir, making it crucial to replace the head gasket to avoid further engine damage. Additionally, some owners have reported coolant leaks originating from various sources, such as a faulty radiator cap, damaged radiator, or degraded coolant hoses, with external leaks from the head gasket being particularly common in pre-2003 models. Problems with the thermostat housing bolts can also lead to coolant leaks if not tightened to proper torque specifications, and ensuring the thermostat gasket is in good condition is essential to prevent such leaks. It is recommended for owners to consult a professional mechanic for effective diagnosis and repair if these issues are suspected.