Can you provide more information:
Is the engine cranking over at normal speed? Slower than normal? Or not cranking over at all?
If it is not cranking, and you turn on the headlights, do the headlights appreciably dim when you turn the key to the start position?
There is no oil sensor in the tank, so low oil, of itself, will not keep the engine from running. But if the oil is low because it has drained from the tank into the engine then the engine is effectively wet sumped and it could take a fair amount of cranking over before the oil has been cleared from the sump and the engine can crank over at full normal speed.
