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I bought a 2012 335i one year ago, with 77k miles on the clock. It has the same engine as yours, N55.
I bought an extended warranty, Route66. However I decided to cancel it. The N55 is reliable (in BMW terms) so I decided to save that money for a rainy day.
In my ownership I only replaced items that are not covered by the extended warranty (battery, spark plugs, tires, brakes).
GL on your decision.
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