You are going to want to get a full synthetic blend for your 2006 Acura RSX. They take a better oil in order to make the car last longer than a car that takes regular oil.
4 quarts to change the engine oil 5.4 quarts in an RSX-S with an oil filter change
5 quarts of oil
Type S k20a2- 7qts
change trans oil at 15,000 interval
It means it's time to change the oil.
3000 miles if using regular oil, 6000 if using synthetic. I use synthetic for my RSX-S, but regular would do for a base model.
Usually your oil needs changing. You have to reset the light yourself. Look in manual it will show how to reset it.
For 2002-2006 Acura RSX, the recommended motor oil types are: For type S models: 5W30 (requires 5 quarts) For NON type S models: 5W20 (requires 4.5 quarts)
It is located at the back of the motor closer to the passenger side.