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Message: <blockquote data-quote="moots" data-source="post: 706884" data-attributes="member: 219">nah.....info for you.<a href="http://articles.mbz.org/engine/diesel/italian/" target="_blank">http://articles.mbz.org/engine/diesel/italian/</a>also google "italian tune-up" and make your own conclusion.i have owned my nissan livina for 5 years and 160k kms and last month i had the spark plugs replaced(first replacement since new-ngk irridium) diy.the intake manifold requires removal (what a pain) and once that is removed i can see the inlet valves and they were CLEAN!i never used any additives or cleaner of any sort.my wife drives the car for pasar and pickup kids but occasionlly when i drive on the hi way i gave it real gas @ 4k rpms......food for thought</blockquote>