Hi,
I'm really not sure why that would happen, but if it was in the gearbox and the gearbox sealed properly, there should be no smell. All I can think of is some was spilled on the box during filling and when it got warm, it caused a smell, or the filler plug wasn't fitted correctly.
It really is a top end oil, one of the most popular oils that we have and used across all kinds of applications. I can't think of anyone mentioning a smell from it before.
Regards
Tim
