If you search the forum, you'll find a few other reports of this happening, although fairly rare. There are instances where some oil can separate from the grease in the Kapex. I have talked to the service team about this topic extensively. It will not affect the operation or the longevity of the saw. Environmental conditions can sometimes cause this (temperature, humidity, orientation the saw is in).
If you feel uncomfortable, swap it for another saw. You have 30 days to return/exchange if it doesn't meet your expectations. Also, a 3-year warranty to back it up.
Shane