- Oct 21, 2007
I mistakenly purchased Shell Spirax 80w90 and put it in my 2008 Tundra rear diff which calls for 75w90. I am located in Edmonton, Alberta and the temps do dip into the -30, -40 celsius range once in awhile. The Shell Spirax 80w90 only has a pour point of -30 Celsius. Please tell me if I am committing differential homicide and if I should drain it for a synthetic lube or if I am wasting my time over thinking this.