I have the same question. I bought that same Moble one 75w90, and was going to use it in my diff. But then I looked at this sheet agian and saw that I got the wrong stuff?Tom Nim said:I went to two auto parts stores and the only Mobil One Synthetic Gear Oil they carried was 75w90. Someone suggested that I use 70w but I forgot who it was. Would the 75w90 be ok to use?