Yes, I'm using it in the rear diff of a 2000 Tundra and a 2004 S2000. I don't have any data to share yet since this is the first fill in both units. I do have a couple of UOA's of LE607 that the 1605 replaced and they were outstanding. Fortunately, I live in a climate that is favorable to use a SAE 110 with a -11F pour point. But even on a hot Texas day, I can hear gear whine in the S2000. Once the temps stay below 70F, like this time of year, there is no whining. If I lived in NE like you, my first choice would probably be AMSOIL SVT 75W-110.