Most posts on this forum say "23 +/- 3" or "30 nm +/- 3" but for the 3.0 or the old 4.4. My spark plug boxes (NGK) don't specify a torque and on their website's chart they quote a "Thread Diameter", what value should I use? I've read that torque on SP really matters so any specifics would be much appreciated!

Thanks.

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'10 X6 5.0i with 7RR Performance Package
'04 X5 4.4i with staggered 20" #168