Engine: - Oil Capacity: 3.5 qt. the appeal of the Softail? Deluxe gets stronger with each passing year. 2016 Harley-Davidson Softail? Deluxe FLSTN Pure nostalgic beauty wrapped around the modern power of a High Output Twin Cam 103B? ? engine. (3.3 l) Motorcycles Cruiser DX938275444849595400185 DX1 ...