Mercury - Extreme Grease with PTFE High-Performance Lubricant Marine Formula 8M0071837. Overview. If you've spent enough time around boats, you know the little things make all the difference especially when they move, pivot, or carry weight day after day. There's a certain comfort in grabbing a grease gun filled with a lubricant you know will hold up in salt, heat, and heavy load without breaking down. That's what this Mercury Marine part brings to the table: confidence. Whether you're prepping