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true they last 100,00kms
the DC5R (not sure about DC2R) come stock with iridiums, as the handbook says they recommend NGK or Denso Iridiums- mine came with denso but changed over to NGK
cost a bit though, NGK didnt stock the type for the DC5R had to go through honda and pay big bucks! (120ish for the set)
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They are about the only two brands that make them. The only difference between them is the heat range. I can't remember which one is very slightly colder have the other. No probs with the NGK's... now 25K+.
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I use BKR7E-11, $2.50 ea.