Mercury - 2-4-C Marine Grease with PTFE Multi-Purpose Lubricant 8 oz Tube 802859A1. Overview. Every boater knows that a little grease can prevent a lot of problems. The Mercury Marine 802859A1 2-4-C Marine Grease with PTFE is the go-to lubricant for keeping your boat's moving parts running smooth. This 8-ounce tube is packed with a lithium-based, high-pressure grease that stands up to heat, heavy loads, and - most importantly - water. It won't wash out, even in saltwater, and is tough enough for