My 2014 Toyota Venza AWD V6 needs LS gear oil in the transfer and diff. Previously, I have been using Mobil 1 LS gear oil with no problems.
Now I want to switch to Mobil Delvac™ Synthetic Gear 75W90 + Red Line friction modifier. Red Line suggest a 4% ratio.

What does the forum recommend for the mix ratio?
_________________________
'14 Toyota Venza 3.5L 70K mi
TGMO 0W-20/Toyota filter (winter)
PP 0W-20/Fram Ultra filter(spring/summer)