Eh?
You're saying any movement and they rip themselves apart, yet all landrover wheel bearings are installed with float. I run oil and I've never had the failures you're predicting.
Landrover oil filled hubs and bearings for decades, how many vehicles is that?
They went to grease so it wouldn't leak out as fast.
How exactly is the oil boiling? Is it reaching the necessary 300C?

