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BMW has dead set protocols to follow and will not deviate from that. My E70 X5M had misfire and ticking sound and BMW told me it was plugs and when asked about the sound, I was told normal. It had BMW original plugs, changed about 15,000 miles ago. Estimate $1175
I came home, changed the plugs to OEM but not BMW (both made by BOSCH, same part number one with M logo and one without) and went back
They told me unless I switched to BMW OEM plugs they couldn't diagnose the problem further. I specifically wanted them to check the injectors on both visits but they declined.
Anyway, they switched the plugs ( $875) and came back and told me it was indeed injectors
X5M has factory Injector issues and has warranty for 12 years/120,000 miles so injector work was covered but not the plugs
I had to reverse the charges and yada yada.
Moral of the story, BMW will try to shaft you where and whenever they can.
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