The car has been having a bit rough idle occasionally and also sometimes almost stalling when changing from P to D right after start up, all this last winter with colder weathers. No error codes though, let's see if the new plugs make any difference. For now, at least my wife reported a healthier start up this morning when going to work.

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09/2003 X5 3.0i Sterling grey

Ex 02/2003 X5 4.6is Estoril Blue