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Message: <blockquote data-quote="boyzone" data-source="post: 1347686" data-attributes="member: 10370"><p>For all member who plan wanna to change spark plug, pls becareful on heat range, which is recommanded from factory, from std heat range change to higer number range plug ( cool plug ) u will face carbon remain , if change to lower heat range , pre-firing/ knocking will occurred in ur engine.</p><p>Doesn't mean the higher number u use, is good for ur car.</p><p>For example mivec engine;</p><p>it run with 11.0 compressor ratio , oem spark plug heat range is at 7, how about for those normal SOHC 1.3 /1.5 and 1.6 engine ?? IS too much over limit to use on this heat range plug.</p><p>Material use is just to extend on plug tip melting point, doesn't mean it will give u extra more power ....</p><p>For myself, I use only 8.2mm cable with std NGK stock from mivec halfcut spark plug only ... just replace the spark plug every 10kkm.</p><p></p><p>just my opinion.</p></blockquote><p></p>

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