which is the best spark plugs for my bmw x5 2001,3.0?
That's like asking " Who's the prettiest girl" Everyone has a different opinion.
Exactly, even the BMW boys fight over which is better....http://www.bimmerfest.com/forums/showthread.php?t=263364
Stick with the OEM plug that is specified in your owners manual and you should be fine.
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