Moms 2010 Fusion

I wanted to know if anyone else has had seal leakage at the AWD gear box assembly due to bearing wear

We have the 2010 AWD and I did do a little asking about the gear box. I understand that the AWD assembly is the same as what's on the Escape. Having said that, I also understand that there are issues with the support bearings pitting due to condensation accumulating in the case oil. This then leads to seal leakage. This problem would be more of an issue in northern climates, like Canada, were we are. My local garage has noticed this problem in the Escape particularly. The bearings are simple tapered roller bearings but are unavailable to purchase separately. One has to purchase a new AWD gear box to repair the problem which is quite costly. I believe the only way to prevent the premature bearing and seal failure would be to increase the oil change interval on the gear box. The operators manual makes no mention of this but I think I will change the gear box oil every second time I change the engine oil. This may help to increase the life of the bearings. I look forward to any comments or ideas.