Complete instructions on how to reset the oil service engine indicator of most car brands without the use of an additional computer
Oil service reset Subaru WRX
Turn the ignition to run (one position before starting engine).
Using the controsl on the left hand side of the steering wheel. Pull the i/Set button towards you to bring up the selection screen.
Use the Up or Down arrow to highlight the MAINTENANCE menu and pull the i/Set switch towards you.
Select the maintenance item (i.e. Engine Oil, Oil Filter) and pull the i/SET switch towards you.
Change the next service date and interval with the Up and Down arrow and confirm by highlighting SET and pull the i/SET switch towards you. The reset is complete when the screen shows Setting Complete.
Turn the ignition off and then start the engine to verify the indicator has been reset.
*Reset only available on models with the multi-information display