You can use any name brand oil in your Honda. I use Pennzoil but that is my choice.
10w40
5w20. I personally use Pennzoil in my 2004 Accord.
10W 40 ATV or motor dydle grade
5w20 weight any major brand. I use Pennzoil in my 2004 Accord and a Purolator filter.
Honda ATV oil 10W 40 ...only use ATV oil not car oil ... I go to the top of the crosshatch marks on the dipstick.. :-)
The official Honda website would have Honda ATV parts for sale or would at least have a list of dealerships that are in your area that sell Honda ATV parts.
It should be designed for motorcycle or ATV wet clutches.
You should post on a ATV forum. See related links for a Honda ATV forum. They will try to help you out.
10w30 Weight any premium brand. I use Pennzoil and highly recommend it.
A Honda
5w20 weight. The brand you use is your choice. I personally use Pennzoil but all major brands are good.