CTS 2008 OIL FILTER

Any info on this will be very helpful, I was hoping to change my own oil and filter on this car,
the oil pan is easy, but the oil filter I couldn't find this. I know this sounds crazy but this is my first American car in years and really enjoy the CTS. I could not locate the filter any where. Can any one help me on this matter? I was hoping to add Amsoil and their new filter to this CTS which is what I been using in all my cars.
 
     Thanks  

any body pls on this?