Just some fyi in case you don't know how to reset it. TcBob could we make this a sticky?
This is directly from the owners manual Section 1-6 "Operation of the Instruments and Controls" under "Service reminder indicators and warning buzzers" Subsection G "Engine Oil Replacement Reminder Light" page 150
Clearing the "Maint Reqd" light on 2005 and up Tacoma's
This light acts as a reminder to replace the engine oil.
This light will come on when the ignition key is turned to "ON" and will go off after about a few seconds.
When you drive for about 7200 km (4500 miles) after the engine oil replacement this light illuminates for about 3 seconds and then flashes for about 12 seconds with the ignition key turned to the "ON" position. If you continue driving without replacing the engine oil, and if the distance driven exceeds 8000 km (5000 miles), the light will come on after the ignition key is turned to the "ON" position. The light will remain on thereafter.
If the light is flashing, we recommend that you replace the engine oil at an early opportunity depending on the driving and road conditions. IF the light comes on, replace it as soon as possible.
The system must be reset after the engine oil replacement. Reset the system by the following procedure:
1. Turn the ignition key to the "OFF" position with the odometer reading shown (For details, see "Odometer and two trip meters" on page 143 in this Section.) (Note 2: 2011 + models may require using the TRIP A reading)
2. Turn the ignition key to the "ON" position while holding down the trip meter knob.
Hold the knob for at least 5 seconds. The odometer indicates "000000" and the light goes off.
If the system fails to reset, the light will continue flashing