Quote:
Originally Posted by SouthArk370Z
The API rating is the more important part. The difference in viscosity between 80W90 and 75W90 is insignificant even at low temperatures.
If you're that paranoid about it, go with 80W90, but I can't imagine using 75W90 ever being an issue with a warranty claim (assuming it meets/exceeds all other specs).
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Truth be told I already ordered some redline 75w90 when posting this thread based on reviews from people on here. But, I wanted to posts this and see what people thought because I just noticed it myself. Funny thing is my owern's manual says you can use 75w90 in the differential for automatic transmission models (I have a manual transmission) but is the differential for the automatic and manual the exact same thing/part?