adding differential gear oil ????
not trying to be a jerk ,just when you sometimes ask a question you get advice,all kinds of answers you werent looking for,ect,ect, i love the guys on here but sheesh,lolol,my truck is new,its not leaking,its not broken,i dont have a ton of miles on it,i dont need to see the write up on swapping oil,just is it syn or reg lololololol
not trying to be a jerk ,just when you sometimes ask a question you get advice,all kinds of answers you werent looking for,ect,ect, i love the guys on here but sheesh,lolol,my truck is new,its not leaking,its not broken,i dont have a ton of miles on it,i dont need to see the write up on swapping oil,just is it syn or reg lololololol

And by the way, the guy you said got it right - is technically wrong...
The manual says 80w90, not 75w90



