I have a 2001 Tacoma S-Runner with the 3.4L V6. The owners manual calls for either NGK BKR5EKB-11 or Denso K16TR11; both of which are the twin ground electrode type.
At several online parts houses when I type in my engine size info they tell me that I can also use the NGK Iridium BKR5EIX-11. This plug is not the twin ground type but at one of the parts houses I read that this plug will last for, I think it was, 110,000 miles and I've found them for from 8 bucks or so to up to about $17 apiece.
I'd like to have plugs that are made to last over 100,000 miles but since they are not twin ground plugs and not what the owners manual calls for, I hesitate.
Has anyone used the NGK Iridium spark plugs in an engine that calls for the twin ground type? What was your experience? Are they worth at least 3 times as much as the ones called for? Do they work as good as or any better than the twin ground electrode type or am I just wasting my money to order the Iridium type?