Mazda 6 2017 Owner's Manual page 414

Maintenance and Care
Owner Maintenance
Vehicle Engine Control Unit Reset Procedure
After replacing the engine oil, it is recommended to have a repair shop such as an
Authorized Mazda Dealer perform the initialization (engine oil data resetting) of the
recorded value. If the value recorded by the computer is not initialized, the wrench indicator
light may not turn off or it may turn on earlier than normal.
Refer to Maintenance Monitor on page 6-18.
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