1977-2000 Suzuki DT5/6/8 Outboards Service Manual, Page 120Get this manual
DT568 Item FUEL&OIL Fuel Unit
('91) MODEL
Suzuki recommends that you use unleaded gasoline containing alcoholwith at least 85 pump octane method)Regular leaded gasoline containing alcohol also usedFor U.S.A CanadaFor 100 parts of gasoline to part of engine oil50 parts of gasoline to part of engine (USlmpgal) (USlmpgal) 24 (6.35.3) For 15 (4.03.3) For other market Genuine Suzuki Outboard Motor Oil NMMA (National Marine Manufacturers Association) certified TC-W Genuine Suzuki oil NMMA (National Marine Manufacturers Association) certified TC-W oil Suzuki Outboard Motor Gear Oil (hypoid gear oil SAE (USllmpoz) 240 (11.512.0)