All this makes me kind of happy I was cheap and got the I6. 30 Min with 0 BMW experience and all 6 plugs changed with NO effort. I did change them at 61k. Cheap and easy maintenance with the I6.

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'03 Black BMW E53 3.0i 110,000+ miles
'03 Black Mercedes-Benz W211 125,000+ miles
'13 White Mercedes-Benz W2o4 New