10W-30 or 5W-30 Is reccomended by Honda, all the Honda oils we get here are made by Caltex in Australia, (Go check the product material data and specification sheets on their site)
You could get 'Caltex Havoline Energy 5W-30' It should be using similar detergents to the 'FEO oil' that has 'Honda' written on it
Otherwise Shell do a Semi Synthetic 'Helix Plus ECO10 10W-30'
it is sold in 5L containers and I have only ever seen it at Kmart here in NZ for $49.95NZ, not even Shell have it on the shelf and it is also from aussie.
Mobil also do a 'Mobil 1 10W-30' but it can only be bought in bulk amounts from distributors, otherwise Holden dealerships should have it.
Castrol Magnatec 10W-40 is also a good oil. And in Aussie all Castrol products are in 5l containers.
The Pennzoil 10W-30 comes in 5L containers as well, there is a lot of bad info about it on the net, but it seems to be related to sludge build up that happened with their oils many years ago (about 15 years), and they have never managed to lose that bad rep with some people, but I haven't heard of any problems with it now, it's also a good price.
I use Mobil 1 5W-50 in my little D15B dual carb LOL, I got 4 packs of it cheap with Kmarts 15% off sale and then a 7.5% student discount on top of that, = $55 each
but I have just put my last one in, and will try the Shell Helix 10W-30 next time, it seems like a good choice, as we have two Hondas to feed here.