A linear energy generator includes a field coil array that has one or more coils of wire, contained within a sealed generator housing and wrapped around a tube. A permanent magnet array is positioned within the tube and includes magnets that move relative to the field coil array to generate electricity. A magnetic lubricant is used between the tube and the permanent magnet array. The magnetic lubricant includes a solid phase component that includes ferromagnetic particles and a liquid phase component that coats the ferromagnetic particles to prevent corrosion and to improve lubricity of the solid phase component.