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In this thread I have read the downside or possible downside to ATF and Synthetics, so why chance it?



What you have read here is opinion and conjecture.


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No one has mentioned a downside to 80w90 except maybe the cold weather.



The weather doesn't have to be all that cold to cause notchy shifting in the 833, the 833 has always had clunky shifting when compared to a T-10 or Muncie. I say give it all the help you can.

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