Suzuki DF25/DF30 Four Stroke Service Manual, Page 12Get this manual
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GENERAL INFORMATION
Viscosity rating 10W-40 Engine oil amounts (USImpqt) 3.0 (3.22.6)Oil change only 3.2 (3.42.8)Oil filter change SUZUKI Outboard Motor Gear Oil (SAE #90 hypoid gear oil) ml (US