My wife used her car without any oil in. I'm not sure for how long but minimum 50miles because she noticed how fast her fuel went down on a journey. After noticing there was no oil in we topped it up and is now at a decent level.

However the car is still using so much fuel 2 or 3 times as much. I can't hear any noises or notice any performance issues.

Is there a fix for this? Would a service help?

The car is a Ford fiesta 2013

Thanks in advance

Lewis