Do u or don,t u Replacing spark plugs

[Oldhead]

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.
.

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!!!

[Scaredycrow]

OK I'll bite:

"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"
- Sure that's *possible*. But thinking pragmatically, surely any difference would be so negligible as to fall inside of the +/- % of the torque wrench you're using anyway...

"Also as a side note do u check the gap even though the new plugs are pre gapped at Denso?????? Again very contencious issue."
- Do I?? No. But then, my plugs haven't needed changing yet! What could possibly be bad about confirming they we're correctly gapped from factory?

[Victa]

Also remember that a spark plug requires a good electrical connection to the head.

Anti-seize could potentially affect this... Obviously the copper based ones are not an issue here.

Cheers,

Chris.

[TD]

No to anti-seize and yes to checking the gap.

[zippymps3]

No to anti-seize and yes to checking the gap.

+1 to this

[Oldhead]

Do not use any antisieze with graphite base as this will corrode aluminium very quickly.
The point of this post is to try and get a diffinative answer as there seems to be a lot of conjecture as to correct proceedure.

Typical (Denso says No, yet NGK apply factory treatment) and i used to anti-seize with cast iron V8 and 6cyc.

---------- Post added at 11:17 PM ---------- Previous post was at 11:09 PM ----------

Sorry my bad!! Should have read ( do u check gap and change gap even though they are factory pre gapped) .

Editing first post.

Anti seize can effect the torque spec by as much as 30% and that is way above the +/- of a torque wrench.