If the oil level is where it should be, looks like you got 'lucky' .
Your call, on whether to replace it or not .
During WWII, it was a common practice, to add a measured amount of fuel into the crankcase, run the engine so it diluted the oil, so when the next day the engine was started, after being 'cold soaked' over night, it wouldn't have the extra drag on the starter due to thick oil .