vickery Posted June 19, 2011 Report Share Posted June 19, 2011 when is it important to change the spark plugs in my 2007 Grandis. i am the first owner of this car and i have never got them changed Link to comment Share on other sites More sharing options...
powerfool Posted June 22, 2011 Report Share Posted June 22, 2011 Every 40k kms is good practice to change spark plug in major service. Link to comment Share on other sites More sharing options...
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