Quicksilver Extreme Grease is an excellent replacement option for engine coupler/spline grease, U-Joint/gimbal grease, and anti-corrosion protection. It provides superior rust and corrosion protection over other greases as well as improved wear protection when exposed to high temperatures and loads. Extreme Grease is a calcium-sulfonate based NLGI 2 grease and meets all GCLB requirements. Same formula as Mercury brand Extreme Grease.