AZRoushStang wrote:Okay, so in my slow progress through the 30K fluid change. I have come to a realization....Nobody sells 80w90 full synthetic gear oil!!!!
Everybody has 75w90, but nobody has 80w90....
Is there really that much of a difference between 75w90 and 80w90???? It doesn't seem like a lot, but I just don't know....
I went a round or two with the local dealerships about this one last fall as 80w90 is great for the mid to southern states but at -45C northern Canada temperatures 80w90 oil is grease and doesn't provide much lubricity. The best answer I could get was that unofficially the northern Nissan dealerships just drop 75w90 in the front final drive diffs and haven't had failures due to using a non-spec gear oil. As to long term wear, who knows...
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