Hello to all. I recently purchased a 2012 RTs and I am in the process of learning about it. i bought it at a consignment shop. I have figured out that the ACS does not work and when I air it up manually it looses air in a short time. Apparently the pump is bad but is there anything else? Also I am trying to change the engine oil and the I can not get the plug out of the oil tank.Any suggestions.