After shopping around I can get Liqui Moly or Redline 75W90 at the same prices as M1, PP and Castrol
Out of the two which is better for my Crosstrek, Q50 and F150? All require GL5 and all have open diffs (no LSDs)
Redline has Friction Modifiers
https://www.redlineoil.com/75w90-gl-5-gear-oil...