Oil level too high? *(check oil level with dipstick fully screwed down!)
or
Leaking valve guide *(rare.)
Cylinder walls not sealing well and oil leaking past rings. *(less rare...nothing you really can do about....just getting used up)
I would change the oil and be very careful to fill only within the full range.
Then, run the unit once to clear the muffler out.
Good luck and be careful!
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