Here's my thoughts. I put it in my T150, D20, Engine, and used the Hub Oil to top off my diffs. Hub oil is supposed to be OK in drives, not just hubs. I later checked my fluids, and the CJ had been parked all day at work and after I pulled it into the shop to check it I found the trans foamed out of the fill hole. I used a 50/50 blend of Lucas and spec'd gear oil. Shortly after that I had to replace the T150 from losing 2nd gear, it started jumping out of 2nd and then it progressed to not going in anymore. Worn forks, but I do not feel secure in the fact that I saw the foamy oil like Bob The Oil Guy first warned about. I have not seen it in the axles or engine.
I do use 15w40 Diesel oil, with maybe a touch of Lucas in it. I just did a full qt of it in this last oil change. Still get a tap in the engine, with hot oil at 10PSI at idle and maybe 30-40PSI over 1500RPM.
The Lucas to me is free, it is leftovers from the times I put it in the semi trucks at work. Many drivers swear by it. I have seen trailer hubs and spindles saved by the Hub Oil being used. Personally I haven't seen any good in my CJ, and the only factual provable bad is that foamy trans gear oil. I just don't put it in my transmissions anymore. I figure the gears are just spinning and meshing so fast they whip the oil into foam, where a drive or engine doesn't since they spin slower.