A compressor system is disclosed that includes at least one fluid compressor for compressing a working fluid and a lubricant supply system operable for supplying lubricant fluid to the compressor. A heat exchanger is provided for controlling the temperature of the lubricant fluid. The heat exchanger includes a housing for holding a plurality of lubricant fluid passageways. A shape memory alloy (SMA) member is positioned within at least one of the plurality of lubricant fluid passageways to increase turbulence in the lubricant fluid at relatively high temperatures.