Got the correct diff fluid put in today. They said they strongly assumed it was a typo on my service sheet, but seeing as how it was 3 years ago there was no way to check and be sure. Fortunately, they decided to change it anyway just to be safe (without me having to put my foot down). Wouldn't have checked my break in service work order if it wasn't for this thread so a big thank you to everyone here for making me paranoid, lol. Hopefully my diff doesn't implode in the near future.
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