In some of my owner's manuals (including my son's 2009 IS350) they call for 90W in the rear differentials. 75W90 in front and transfer cases.
I'm trying be true to the owner's manual and there has to be a reason they did not specify the 75W-90 for the rear. They do give the option
of using a 80W90 if it gets below 0F.
It seems "everybody" is using a 75W90.
Remember, this is BITOG and some of us have inquisitive minds and some don't.
And you can see in my sig I have been very successful in using Amsoil and Schaeffer gear lubes.
This is a question for knowledge.
There has to be a reason they choose 90W.
I'm trying be true to the owner's manual and there has to be a reason they did not specify the 75W-90 for the rear. They do give the option
of using a 80W90 if it gets below 0F.
It seems "everybody" is using a 75W90.
Remember, this is BITOG and some of us have inquisitive minds and some don't.
And you can see in my sig I have been very successful in using Amsoil and Schaeffer gear lubes.
This is a question for knowledge.
There has to be a reason they choose 90W.