2017 Western Star 4900FA Engine: 12.8L L6 DIESEL; Position: Fan;. 2017 Western Star 4900FA Engine: 14.8L L6 DIESEL; Position: Fan;. 2018 Western Star 4900FA Engine: 14.8L L6 DIESEL; Position: Fan;. 2018 Western Star 4900FA Engine: 15.6L -6 DIESEL; Position: Fan;.
