So i blew my t case 8 months ago on my 05 evo viii. 1 month after i got my new clutch installed. Last month i finally saved enough money for a new transfer case from shepherd. Shepherd told me that it blew because of the incorrect oil being used. Shepherd told me to use #3775610 w90. But today i went to the dealer and they assured me to use diaqueen 75w85. They told me that they use that oil on all there evos. Then i went to my mechanic and he told me that he used 75w85 on a couple of evos and none have had any problems. I tried searching here but i see a whole lot of different oils. Has anyone used either 90w or 75w85? With what results?Any help is greatly apprecciated.

 

From what I have read, it's either Diaqueen or Redline. I am using Diaqueen.

 

always use diaqueen if you want to avoid problems. any other type you use should be a straight 90(like the diaqueen) and very few companies make a straight 90.

 

diaqueen is what i have been told for most part, ill double check with john tommarrow though...