Originally Posted by
Dan Burkhart
I serviced one recently that the owner had used ATF instead of the Shimano oil. I don’t believe that the ATF did any damage to the hub, but it was obviously incompatible with the drive side cap as it had swollen to the point that the threads no longer engaged the hub and all the oil had leaked out.
Funny. I mentioned this possibility once and because BikeForums had someone post back I didn't know what I was talking about because they'd put 117,000 miles on their Nexus using nothing but ATF and never had a problem.
