Quote:
Originally posted by bradbury
Wouldn't worry about cleaning around the holes - the coils form a good seal.
I switched to the Bosch +4s, and I've been happy.
The Denso iridiums are very good plugs, and will provide performance for longer than any other plug, but you do pay for it. The +4s are spendy at $6 each, but the Densos go for $11 - $15 depending on source.
$100 seems like a lot for a plug change, but with Iridiums you don't need to change them for (supposedly) 100K miles, and it'll run a lot better at the end of that time then with platinums. Or so they say....
It all really hinges on your preference, and how much you want to spend on a spark plug change.
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This was covered once before as to the cost. Here's an old post of mine: You should be able to get them locally at an auto discount store for no more than $6.40 each - If not try this site for $6.40 each. Just type in the item # which is 6418 for the Iridium IX which according to NGK is for the Toyota Tundra 4.7L. The 6418 is also called the BKR6EIX which is your hi-performance Iridium NGK plug, they also make the BKR6EGP which is a single platium NKG plug and the BKR6EYA which is the standard nickel NGK plug. The IK20 is a Denso plug and cross references over to a BKR6EIX-11 NKG plug. The BKR6EIX-11 is exactly the same as far as makeup is concerned compared to the BKR6EIX with the only exception being the gap is .044 instead of .032. The item # for this wide gap Iridium NGK plug is 3764. The IK20 is also gapped at .044.
http://www.monarchproductsinc.com/ngk.htm