Quart marine gear oil. M8 Synthetic SAE 75W-90 Marine Gear Oil is a pure synthetic, non foaming, super slick, long lasting lubricant designed especially for marine applications. The longevity of your boat and the way it looks depend on the quality of the products you use for its maintenance. Only the finest products will allow you to achieve desired results without putting a strain on your neck and back. Made from high-grade materials utilizing state-of-the-art machinery, this product is exactly the one you need to keep your boat in mint condition year in year out.