FUSO’s air filters are made of heat-cured adhesive and impress with their exceptional impermeability. The filter seals are made of high-strength, oil-resistant rubber, which maintains their elasticity for a secure seal. The filters are less susceptible as they contain a weaker air-dried epoxy than conventional air filters. When harmful contaminants are mixed into the engine oil, it accelerates oil wear and tear. FUSO air filters have been extensively tested for effectiveness and durability, helping to extend engine life and improve fuel economy.