Suzuki 2002-2005 DF4/DF5/DF6 4-Stroke Outboards Service Manual, Page 150Get this manual
DF456 "K3" ('03) MODEL 10-3 Data
FUELOIL
Suzuki highly recommends that you use alcohol-free unleaded gasoline with minimum pump octane rating of 87+ method) or 91 (Research method)However, blends of unleaded gasoline and alcohol with equivalent octane content may be used
Fuel tank capacity (Built-in tank) Engine oil
L (USImpgal)