This is how you do it on a MK4 Mondeo, worth a go:-
1. Close all doors.
2. Turn the ignition key to position II.
3. Simultaneously press the accelerator pedal and the brake pedal and hold for a minimum of 15 seconds.
4. The oil change reminder indicator will turn off. This confirms that the reset procedure has been correctly completed.
-cu contactul luat
-tineti apasat pedala de frana si cea de acceleratie in acelasi timp
-dupa aproximativ 30 secunde becul de la ulei palpaie eliberati pedalele
-resetare reusita
ENGLISH:
-turn contact off.
-press brake and accelerator at the same time
-hold for 30 secs, when the service lamp starts blinking, release pedals and the light goes off
…until your next oil change is due.