So awhile back I mentioned changing fluids in my '02 silverado 4wd. I'm finally getting around to having the time to look at doing it. In the suggestions people offered here so kindly I started looking at VI and other stats for Dex VI fluids. I was looking at Castrol Transmax (the one for Dex VI) since it has a VI of 161. Then I looked at Redline that has a VI of 166. Then I noted that the KV100 for castrol is 5.9 and redline's is 6.4. Then I noted that the brookfield values @ -40 for castrol were 10k while redline's was 4500. It seems to me the redline is better but all these numbers make my head spin. Any thoughts?