The td sheet explains it better than I. 219 synforce was designed for high shock loading, high pressures, in equipment with exposure to hot and cold with high amounts of water and dirt. Designed to compete with the calcium sulfonate and calcium sulfonate complex greases. Its roll stability test astm d-1831 and water washout astm d-4048 tests are where it outperforms vs. the 274.
High quality Specialized Lubricants pay for themselves!