Re mass purchase of Denso Iridium plugs ,a very Contencious issue . Do u anti seize your new plugs .
Denso literature says NO.
Ngk literature says NO,but Ngk are pre coated with their own AS.
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Anti seize ,a very small amount ,is supposed to assist in removal from aluminium heads , but can also cause u to have incorrect torque specification,leading to incorrect seating .
Also as a side note do u check the gap and adjust even though the new plugs are pre gapped at Denso?????? Again very contencious issue.
Both these issues would welcome a Poll!!!