That sounds like good oil pressure. The weight of oil you are using should be fine, then. If the bearing clearances were too big, then this would be reflected with low oil pressure due to more oil leaking through the larger clearances. A higher viscosity oil will have more resistance to flow, and thus a higher pressure due to less of it leaking through the bearings due to the fact that it is thicker. It is up to you what you want to use, either weight oil is approved, and your oil pressure is normal.
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