I also switched from 10w-40 to 5w-30 Total in my current ride, and engine noise increased. But IMO, nothing to worry, as a silent / sunn engine is not a sign of healthy engine, or, engine is running comfortably.
Its not a weham. Your observation is right.
IMO, 5,000 Kms / 06 months, which ever comes 1st, along with genuine oil filter.
If oil level drops on dipstick, simply top it up, but if you observe blue smoke from the exhaust, then not a good sign regarding engine health.