Mercury-Mercruiser 35-881126K01 High Efficiency Oil Filter Mercury OEM oil filters screen particles smaller than 11000th of an inch, keeping engine oil cleaner for longer. This high level of screening efficiency assures a constant level of oil to engine parts. High efficiency filters should be changed after every 50 hours of normal use. Metal shell is over 50 thicker than conventional filters. Durable paint finish resists corrosion even in saltwater. Application Mercury Mercruiser Hi-Performance