final drive oil 75w140

[KSMITH]

hi all

dont want to start a new oil war, but i see autozone is selling castrol syntrax 75w140 for 59.99 , where are the 75w90 is 89.99

any of you guys used 75w140 before and is it ok to use in the final drive - despite the spec being 75w90 being the requirement?

thanks

 

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