Mercruiser oil filters are constructed of the highest quality materials and made specifically for marine applications. Mercury uses a unique filtration system to screen particles smaller than 1/1000th of an inch to keep your oil cleaner longer. High-efficiency design assures a constant flow of oil to engine parts. This oil filter is designed to fit all Mercruiser sterndrive and Inboard GM engines except 4.3L V6 without remote oil filter, 3.0L, 4.3L V6 with remote oil filter, 5.0L 305, 5.7L 350, and more! Replaces Mercury 35-866340Q03 and Sierra 18-7824-1