Mercury 35-877761K01 FourStroke Outboard Oil Filter The Mercury 35-877761K01 Oil Filter is a genuine OEM replacement filter. Mercury high quality outboard oil filters provide the ultimate protection for your engine. The unique filtration system screens particles smaller than 11000th of an inch to keep your oil cleaner longer. A high-efficiency design assures a constant flow of oil to vital engine parts. Application Mercury and Mariner 1731 cc. 75-115 HP FourStroke outboards sn 1B366823-2B094995