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In order to keep your marine engine running and avoiding costly repairs, it is important to change out your boat oil during your routine maintenance. Just like your car engine needs oil, your boat engine requires oil. However, marine oil typically has extra additives that help protect the engine from corrosion, moisture, and oxidation that can develop from marine conditions. OC Boat Supplies knows how important it is to have high-quality boat oil, that is why they only carry the top brands like Johnson/Evinrude.