Hello Anthony from the Homeland.
Can we take it you bought the car from an Audi main dealer? If not, the following may be different, but….
Am I right in thinking that you were told in May that the car had service history, yet you didn’t check that this was correct, via. a copy of the recorded service detail on the Audi database, and you knew that service books and stamps no longer applied?
If I’ve got it right, you are now concerned that the ‘service indicator’ is informing you it needs servicing again, despite your son only covering 200 miles since last May.
Are you sure its saying ‘Oil change’ rather than ‘service due’?
If ‘service due’ then it could be for say a brake fluid change, or indeed the Service Indicator may not have been reset.
Apologies for all the questions, but the extra detail would help.
Many thanks and kind regards,
Gareth.