Reddit reviews NGK # 6509 Iridium Spark Plug LTR6IX-11 - 6 PCSNEW
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FREE SHIPPING to anywhere IN USA and territories For This ItemBetter PerformanceGood Brand Name NGKIridium1order = 6 Pieces
Done! In case anyone else needs plugs for their CTS4 3.0L, here's the info for NGK plugs (my preferred brand):
NGK 6509, LTR6IX-11, Iridium IX
Gap: .044"
Socket size: 5/8"
Amazon has a slightly better price than RockAuto.