Mercury Cougar cracked head or blown gasket issue with potential seal concerns on Mercury Cougar

Some Mercury Cougar owners report experiencing issues such as white smoke from the exhaust, which can indicate a blown head gasket or a cracked cylinder head. Additionally, some owners have noted repeated head gasket failures, often caused by undetected cracks in the cylinder heads that require thorough inspection. Others have observed oil in the coolant, a potential sign of a blown head gasket, but caution against jumping to conclusions, especially given the aluminum construction of the Duratec engine that may also harbor cracks. Performance symptoms like uneven running, hesitation, or power loss have been reported, suggesting possible misfires linked to head gasket issues. To address these concerns, it is recommended that owners consult a qualified mechanic or technician for accurate diagnosis and appropriate solutions.