Not sure why you would want to switch? Copper plugs will wear faster. My 2009 came OEM with Iridium's and they are rated to 120,000 miles. I am at 104,000 and plan to switch mine out sometime this year. Mileage is not necessarily a perfect indicator since half of my commute time is spent stopped at stoplights. Still.... 10 years on a set of iridium plugs is decent.

 

Rockauto list that Denso K20R-U11 for your car so it is ok to use. But unless you are selling the car you might as well use Platinum spark plugs as it will last 2 times longer while only paying a buck more a piece. If you hate to change your spark plug often and want it to last 120,000 miles go with Iridium.

 

In Pakistan/Indian and many African countries, there is quite a price difference between the two. I think that's why the OP is asking.

 

Although copper plugs last about 1/4 of iridium's life span, performance wise copper plugs are much better than iridium...

 

... performance wise copper plugs are much better than iridium...

Really? How so?

 

And it is SO easy to change the plugs on a 2AZ-FE. Like a 5 minute job.

 

Using copper is fine, iridium just lasts a lot longer. Buy what ever you can afford....