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Sparkplugs should be changed at regular intervals, it will usually state how often in the service manual and most garages will do it during a service regardless. It is no harm and often a good idea to check the sparkplugs yourself as the condition of the sparkplus can hint at other problems in an engine. See the following website for more details http://www.ngksparkplugs.com/tech_support/spark_plugs/faqs/faqread.asp Depending on the engine it can be a relatively straightforward task or an agonizing ordeal.
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