Honda BF50 (5HP) BF5A Outboard Motors Shop Manual., Page 18Get this manual
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IllMAINTENANCE 1ENGINE OIL 2GEAR OIL 3SPARK PLUG 4VALVE CLEARANCE 5FUEL LINE FILTER 6FUEL TANK FILTER
SAE10W-30 is recommended general, all-temperature use; service classification SE or S