David C. wrote:
....
I have an undercut/jamb saw, ... I opened the case, and found oil inside the
case. ...
Since there's no way of getting oil back in the saw, just wondered if this
will present a problem. Will the saw burn up prematurely?
....

Depends on how much was lost compared to what original quantity was.

And, there has to be a way to get oil in; if it was there initially it
didn't get there by magic...

--