What can cause leaking oil from a compressor?

A faulty oil seal is a primary reason for leaking oil from a compressor. The oil seal's function is to prevent oil from escaping the compressor and to create a barrier that keeps contaminants out of the oil system. When the seal is damaged, worn out, or improperly installed, it can no longer effectively hold the oil in place. This can result in oil leakage, which not only diminishes the lubricant needed for the compressor's operation but can also lead to more significant mechanical issues over time.

In the context of the other options: excess oil pressure might contribute to leaks but usually results in oil escaping from weaker points in the system unless the seal itself is compromised. Overheating can cause oil to thin but does not directly lead to leaks unless it exacerbates an existing fault like a damaged seal. A clogged oil filter can hinder the flow of oil but is less likely to be directly responsible for visible oil leaks compared to a malfunctioning oil seal. Therefore, recognizing the critical role of the oil seal helps in diagnosing and addressing oil leaks effectively in a compressor system.