Probably no harm done.
merely drain it out, replace the oil and oil filter.
Should be fine.....I know of a couple of motorcycles that suggest 5/30 for "cold weather," operation....
And, if you're "fooked," at least we all heard about it here!
I guess the biggest factor would be the hot properties of the oil ie. Xw40 vs a Xw30....the 30 acting as a thicker oil at running temps.
Who knows, you might even see a slight improvement in mileage and/or power becase of the better sealing abiities of the thicker oil, but then again, a slight power loss in the upper RPM range due to viscosity restrictions.
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