After 12 years and 10's of thousands of miles a tire tech advised me that I should have my brakes and wheel bearings checked. Bottom line breaks were still good and the wheel bearings also. I do not...
As with many things there are different grades of bearings and as with many things many of the come from China where quality control may or may not be a force, or just price. I replace the Chinese made beings on our Dexter axle with Timkin and used synthetic grease.