Part Number: OL41. Filter Type : Screw-on Filter. Bypass Valve Opening Pressure [bar] : 0,8. Expert Support. Part: Oil Filters. Search by Category. We pride ourselves in being the Car Parts Experts, with our team collectively having over 250 years of experience in the automotive sector, and our passion for all things automotive has helped us build a product range to suit every possible need you will have for your car.