The photo's of the gunked up engine on the website are pure scare tactic. Those photos are not a typical engine at any mileage. A normal service interval and synthetic oil is adequate for long engine life. I personally have driven BMW's to 250K miles without any problems or excessive oil consumption and there are many engines around over 300K running well with normal synthetic oil maintenence.

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2013 X5 3.5i M Sport
2004 M3 cabriolet SMG