does my oil burner blower need oiled and if so where?

I have an older Hi-Boy oil burner furnace direct drive blower. Lately, the blower seems to be vibrating, almost like it's loose. My first thought has been oiling it, but the manual says it's permanently lubricated and oiling only applies to belt driven blowers. I just had the furnace cleaned and serviced a month ago and all went well at the time. The blower is very difficult to reach without tearing apart the furnace housing, but when I place my hand in there to feel the blower cage, etc, it doesn't feel loose to me or anything like that. Just when it runs, you can hear the vibration. Is it possible that the burner does in fact need oiled and, if so, where? I've never quite bought into the idea of permanently lubricated motors and the manual does mention placing a "drop of oil on shaft at each end of bearings". I have no idea where this location would be.
Any assistance would be appreciated.
Thanks in advance, Jason
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sounds like it has sealed bearings in which case it is pointless to attempt oiling. replacement is inevitible
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