I am trying to find some information on engine oil storage tanks filter vents, we are using 500 gallon tanks in remote areas to provide engine oil to the engine through automatic level controllers.
When the storage tanks are filled there is a vent on top of the tank to release the air inside the tank. As the engine uses the oil air goes back in the tank, non-filtered and could be contaminating the oil. Does anyone recommend a filter vent that I could use? It is a 2”NPT connection.