BF10DK2

What engine oil should I use in my Honda.

SAE 10W–30 API service category SE or later (or equivalent)  is recommended for general use.(except Marine and Snow Blower)
Please check Owner's manual for Outboard Engines and Snow Blower engine oil

What fuel should I use in my Honda?

Honda engines are designed and certified to run on regular unleaded gasoline containing no more than 10% ethanol (E10).
E85, a mixture of 85% ethanol and 15% gasoline, has been in the news recently. E85 is an alternative fuel; it is not gasoline. Honda engines are not designed or certified to run on E85 or any other alternative fuel.
Always refer to your owner's manual for the recommended fuel and the currently approved additives.