Originally Posted By: wantboost
It's for a 2006 cts 3.6
Any of these three would be best:
Mann HU 69/2x
Mahle OX399D
Hengst E622H
(I think all three may be the same filter, made by Hengst in Germany)
Note that Hengst is not the OE supplier for this particular cartidge, although Hengst does make plenty of AC Delco cartridges!
If you desire a wire-backed synthetic filter, there is the Wix XP 57079XP (Napa Platinum 47079)