I seriously doubt the type of oil you put in a final drive will be the root cause of a 'whine' sound.
You are listening too hard and hearing things....
The special Yammie whale jizz final drive oil supposedly has an anti-foaming agent for high speed operation. Whatever. It's expensive, but as noted above it is changed so infrequently and uses so little that cost is not a big factor for me. Over 600,000 miles on FJRs and I've used the super-duper, special Yammie whale jizz and Mobil 1 75W-90 synthetic. It's just oil. Nothing magic.
Ride more, stress less!
Purveyor of crooked facts