Bad ignition coil. Replace all?

[Greg C]

Have a 2013 35i with 135K.
Had coil for cylibder 4 go out. I have already replaced it.
Question is, should I replace all of them?

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[andrewwynn]

I did on wife's n55. We replaced 2-3 that were acting up then did all the rest.


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[Nanniepoo]

It would be my philosophy to replace all of them at that mileage.

[Henn28]

Same…Im lazy enough that I wouldn’t want to unwrap the top of the motor again in a month or two when the next one fails. Plugs too if they are that old!