Follow the recommendation in the manual.
On my data system it confirms that the preferred viscosity is the 5w-30 so stick with that. All other viscosities are listed as alternatives so you've done no harm using the 5w40 but there is no sense in not using the preferred viscosity. The great thing is you have an almost endless choice of 5w-30 oils that meet the performance spec for your engine.
Personally I would avoid the C2, C3 oils as they are low saps which you do not need.
On my data system it confirms that the preferred viscosity is the 5w-30 so stick with that. All other viscosities are listed as alternatives so you've done no harm using the 5w40 but there is no sense in not using the preferred viscosity. The great thing is you have an almost endless choice of 5w-30 oils that meet the performance spec for your engine.
Personally I would avoid the C2, C3 oils as they are low saps which you do not need.