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If you're afraid that the dealership isn't changing your oil, then put a hidden mark on the oil filter to check for later.
After leaving a shop I always pull over and check oil levels, wiping the dipstick with a paper towel to check the color.
It would be distracting if the speedo updated at a faster rate.
If you want a faster speedo, connect a bluetooth OBD reader and run Torque Pro app on your phone. You'll see there that the engine computer has no problem refreshing quickly.
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