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Old 01-29-2022, 05:56 PM   #9
Mountain

 
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Drives: 2017 SS 1LE, 2016 1SS (previous)
Join Date: Apr 2016
Location: Metro-Detroit
Posts: 1,819
Also had a TrueTrac in another car (Mustang). I ran Mobil 1 or Valvoline 75w-140 (both as synthetic). If your car doesn't have a diff cooler, run the thicker weight (140). If it does have one, go with a lower weight (90).
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