Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 54Get this manual
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GENERAL SPECIFICATIONS (F8CW) Model F8CW Unleaded regular gasoline 86 91 4-stroke engine oil API SE, SF, SG or SH SAE 10W-30, 10W-40 800 (27.0, 28.2) Hypoid gear oil GL-4 (SAE #90) 150 (5.1, 5.3)