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Well this year alone I just finished up a 5th 2006 and up DTS with the so called improved 11 x 2.0 thread design. The new style head bolts are loosening up over time and causing overheat issues with a lack of torque on the head bolt. This past car I finished was from Chicago and only had 80K and 6 of the 20 head bolts were loose. So, the fix is to either install a Norms insert or a 11x1.5 timesert and buying the old style 11 x 1.5 head bolts.