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Exxon OilShield Reservoir Breathers Filters help to maintain oil quality and to eliminate maintenance concerns by working to prevent water and airborne dirt contaminants from entering lubricant reservoirs, gearboxes and storage tanks. These Breather Filters are available in three models – XON-2S, XON-3S and XON-4S. All three models of Exxon OilShield Breather Filters feature an advanced, patented design that helps remove contaminants that can affect oil quality. ExxonMobil recommends replacing these filters when the color changes from blue to pink, or after one year of service, whichever happens first.