Rogue One wrote:Welcome! I'd say the greasemonkey that did the oil change slopped some oil on the engine block. It'll burn off after awhile.
+1, this is a probable reason. Look under the hood and see if you see oil around the oil fill cap or by the air filter.
If you see some oil, you can clean it up with a rag or if there's not much, it'll burn off as Rogue One said.
While you're there, check the oil level on the dipstick with the engine cold and parked on level ground.
(In case you didn't notice oil, you can at least note the oil level and if you still smell burning oil, you can re-check the level periodically to see if it's dropping, this might signal burning or a hidden leak).