2015 Tacoma Transfer Case, 4K mi., Amsoil SVG

[btanchors]

Here is the second UOA of my transfer case. I'm rather puzzled by the 1% insolubles. I do not think it is due to oxidation at only 4K miles. Plus, viscosity is normal, and TAN is normal. The oil looked very clean when I drained it, as I would expect after only 4K miles. Plus, I hardly used 4WD at all. I was planning to take the newly installed fill 30,000 miles, but with insolubles this high, I am not sure what to make of it. Comments?

 

[CT8]

It takes a little more than half a qt if the transfer case is like my sons 2006 Tacoma . Not a whole lot of oil. change it after 10,000 miles with out a uoa then again when ever you change out the diffs and trannie.