After driving mine every day through the recent Texas ice days, I parked it for a bit and drove my other car when it got nice out. I hopped in the X5 to make a grocery run only to find it misfiring.

replaced the coils and plugs and she's good to go again. I did spot a minor leak on the valve cover and the oil pan, but not bad enough that they're spotting the driveway yet...

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2001 e53 X5 Manual