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SIC.....anybody going? Add to petrol tank?Good or not?

i've ALWAYS used Denso for my previous rides... always thought that japanese plugs would be better for japanese cars... till i got the OWS package and choose the plugs over the air-con package some time back... this is a pic of my OWS plasma iridium plugs after approx 15000km of use with 3 oil changes... during this 15000km i have approx 30 full tanks in my petrol... with additives added... and the occassional spritied high rev driving now and then... *my green oil 10ml-10liters ....... for about 15 tanks.... *OWS injector cleaner... 2 tanks... *prostaff water remover... 1 tank... *prostaff injector cleaner.... 1 tank... *power max cylinder lubricant injector cleaner from ah boy (watery stuff)... 1 tank.. *bulls eye or smthing a korean brand injector cleaner (transparent thick liquid)... 2 tanks.. *approx 5 tanks with no addtives... and yes mileage does go dwn a little... no sure how much cause i drive differently all the time... maybe 20-30km less mileage without additives.. no kidding... *Putoline959 Racing 2T... approx 5 tanks till i took out the plugs to check at 15000km... i then washed the plugs with my gunk brake cleaner... i scraped off the carbon on the edge of the plugs... they work fine... never missfire before and great till now... i wanted to change new plugs as i have a new set with me from the oil change package... but will try till 20000km and see how as its still great... but i cannot imagine myself using till 50000km... heard some plugs can use till 100000km... true?