2005 owners...NGK spark plugs, ITR6F13 or ITR5F13? - Mazda3 Forums : The #1 Mazda 3 Forum
 
LinkBack Thread Tools
post #1 of 5 (permalink) Old 02-05-2010, 11:54 AM Thread Starter
Senior Member
 
Join Date: Aug 2006
Location: Milpitas, CA
Posts: 1,237
2005 owners...NGK spark plugs, ITR6F13 or ITR5F13?

I noticed my car (2005 2.3) came with ITR5F13. Manual states ITR5F13 as well.

Yet when I look up spark plugs on www.ngk.com, it lists ITR6F13 as being the ones for my year.

So which is it?

Any 2005 owners, what did yours come with? I did read about a TSB for "Hard Start" that mentions using the ITR5F13 instead of ITR6F13 to help the issue, but the TSB was for 2004 models.

spikeymike is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 02-05-2010, 01:16 PM
Le Mans: GT Class
 
Join Date: Jul 2005
Location: Boston, MA
Posts: 704
Re: 2005 owners...NGK spark plugs, ITR6F13 or ITR5F13?

either one should be fine.
id probably go for the 6f if its at all modified.
that one is the stock plug the 5f run is one heat range hotter
to burn possible contaminants from the plug,.
mine were changed to the 5 version
at the dealer due to some cel back in 05
i changed them myself to an autolite plat.
with just the standard reccomend plug
with no difference.
defski2004 is offline  
post #3 of 5 (permalink) Old 02-05-2010, 01:23 PM
F1 Driver
 
Join Date: Dec 2004
Location: San Francisco
Posts: 10,722
Re: 2005 owners...NGK spark plugs, ITR6F13 or ITR5F13?

The 6F is one step "colder" than the 5F. A colder plug is better if you drive the car hard but is more susceptible to fouling if the car is idled a lot, never sees above 3k RPMs, etc.

Mine came with the 5F too, and I don't see a reason to switch to the new recommendation unless you're getting any knocking in really hot weather on 87 octane and/or drive very aggressively. If you do, switching to the 6F may help a little. The main reason not to switch when replacing plugs on an 04-05 would be if you drive really conservatively and/or idle the car for long periods, because you may see fouling with the 6F that you aren't getting with the 5F.
cali_axela is offline  
post #4 of 5 (permalink) Old 02-05-2010, 01:33 PM Thread Starter
Senior Member
 
Join Date: Aug 2006
Location: Milpitas, CA
Posts: 1,237
Re: 2005 owners...NGK spark plugs, ITR6F13 or ITR5F13?

Yeah, I'm not having any issues with the 5F, so I may just stick to it.

Just weird having two sources listing both plugs as a replacement.

spikeymike is offline  
post #5 of 5 (permalink) Old 02-05-2010, 01:39 PM
F1 Driver
 
Join Date: Dec 2004
Location: San Francisco
Posts: 10,722
Re: 2005 owners...NGK spark plugs, ITR6F13 or ITR5F13?

Yeah, they'll probably provide the best efficiency for the car if you're not getting any knock.
cali_axela is offline  
Sponsored Links
Advertisement
 
Reply

  Mazda3 Forums : The #1 Mazda 3 Forum > Technical / Model / Performance > Powertrain 2004-2009 Mazda3 > Powertrain Technical Information, FAQ's, How-To's

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mazda3 Forums : The #1 Mazda 3 Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Image Verification
Please enter the six letters or digits that appear in the image opposite.

Registration Image

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome