Front Driver Side Windshield Wiper Motor (WM943) by Motorcraft®. Tested for long life and quiet operation. Durability tested to meet a demanding 10-year/150,000 mile service life specification, exceeding 1.5 million operating cycles, for passenger cars and light trucks. Rigorous tests include low and high speed durability, 96-hour continuous salt spray, temperature and humidity extremes from -40 degrees F to 212 degrees F. System-load tested to eliminate bothersome radio static and other electronic noise interference.