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.
dip stick
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
2.11337 qt
It means it's time to change the oil.
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)
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.
It is located at the back of the motor closer to the passenger side.