Honored Advisor
Posts: 17,960
Registered: ‎05-13-2010

Can you mix 85w 140 and 90w 140 in final drive?

They don`t make that 90w 140 anymore outside of Saudi Arabia.  i have a old oat combine I`m sure 90w 140 is in the final drive, but can a guy top it off with 85w 140? They say some of the new gear oils have sulfer that`s hard on brass bushings.  Or should a guy drain the old and put in the new 85w 140 and not worry about it?  Or am I being Sheldon Cooper about this?  Smiley Happy