Subaru Legacy oil pooling on top of engine near front passenger side, not from head gasket on Subaru Legacy

Some Subaru Legacy owners report experiencing oil pooling on the engine near the front passenger side, which may not be due to a head gasket issue. These owners have identified several potential causes, including leaks from a damaged or worn valve cover gasket, which can lead to oil accumulation. Additionally, leaks from the oil sender unit and oil sensors under the alternator have been noted as possible contributors to the problem. A faulty PCV valve may also cause oil leaks, while previously applied oil leak sealant might not have effectively resolved the underlying issue, resulting in recurring oil pooling. Furthermore, some owners have found that a damaged oil pan gasket or a loose oil temp sender can also lead to similar oil pooling issues. It is advisable for owners to systematically inspect these components to accurately diagnose the source of the oil pooling.