4 cylinder spark plugs

I'm at about 30,000 miles and was going to replace the spark plugs in my 2.7l. Looking at the service schedule, it looks like only the 6 cylinder engines require the plugs to be changed every 30,000. From what I could tell the 4 cylinders don't require the plugs to be changed until 120,000 miles. Is this correct?

Thanks

 

its true.....the 4 cyls come from the factory with iridiums already there, so you can change them out at 120k. the v6 comes with standard copper core plugs which need to be changed every 30k.

 

cool, thanks.

 

That and the timing chain make this 2.7 pretty solid and easy to drive/care for.

 

May be a dumb question, but is there any reason to worry about the plugs getting seized in the cylinder heads after 120,000 miles? Any need to take them out and put a bit of anti-seize on the threads?