Wherever DEXRON III , DEXRON II-E , DEXRON II , DEXRON , MERCON , M2C138-CJ , M2C166-H or Type A fluids are recommended . In all automatic transmissions built by GM . Wherever Allison C-4 fluids are required . May be used in some hydraulic and compressor systems where excellent low temperature flowability is required . May be used in some hydraulic and compressor systems where excellent low temperature flowability is required .