Behtreen scene, keep using the same oil till 5000kms. Check periodically for abnormal oil reduction. You can use 10w40, 10w30 or 5w30. Honda recommends 5w30, but the other oil grades are fine too. 10w30 and 5w30 are the same viscosity once the engine warms up.
I use 10w40 in my car, works fine.