ABSTRACT
This chapter concerns lubricants for internal combustion engines, which are gasoline or diesel fueled, as opposed to those with turbine or hydraulic drives. In these engines, fuel is combusted in the space above the piston, forcing the piston to move down a cylinder. This linear motion rotates a shaft through a crank mechanism, powering the valves used for air/fuel introduction, all the ancillary equipment on the modern vehicle, and finally the drive wheels or propeller.
