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post #1 of 13 (permalink) Old 07-17-2013, 05:16 PM Thread Starter
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Spark plugs for 2009 X non turbo

I need to replace the plugs on my 2009 X Limited. Should I use the recommended NGK replacements or upgrade to the Platinum version from NGK with hopes of more efficiency/performance?

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post #2 of 13 (permalink) Old 07-17-2013, 05:29 PM
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Originally Posted by FLsubie View Post
I need to replace the plugs on my 2009 X Limited. Should I use the recommended NGK replacements or upgrade to the Platinum version from NGK with hopes of more efficiency/performance?
You already have plats. Go with the NGK OEM.

https://www.subaruforester.org/vbulle...nt-anal-55431/


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post #3 of 13 (permalink) Old 07-17-2013, 05:31 PM Thread Starter
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Good to know

If the 2009 NA motor has plats, then why do we have to replace them every 30,000 miles according to the manual?

Just curious

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post #4 of 13 (permalink) Old 07-17-2013, 05:58 PM
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The official answer from Subaru of America is: The spark plug used on the 2.5L engine has a platinum electrode, but the core is not platinum. Therefore, the replacement maintenance interval is 30,000 miles.

The EJ25 engine (yours, mine) utilizes a waste spark ignition system. Some useful info from NGK on what type of spark plugs to choose for longest service interval in a waste spark system:

Waste Spark Ignitions!

Last edited by Lone Ranger; 07-17-2013 at 06:08 PM. Reason: corrected content
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post #5 of 13 (permalink) Old 07-18-2013, 03:33 AM Thread Starter
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Thanks

Lone Ranger: thank you for the education and information.
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post #6 of 13 (permalink) Old 07-18-2013, 05:36 AM
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Originally Posted by FLsubie View Post
Lone Ranger: thank you for the education and information.
Let me add though that most of us that have replaced this plug realize it will go well longer than 50,00 K miles let alone 30,00. Its flat out un-necessary to replace plugs at 30 K miles.

I would still go with the NGK OEM's.

And Even though Lone Ranger is correct Subaru is just blowing smoke up our buttt,

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post #7 of 13 (permalink) Old 07-18-2013, 06:21 AM
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Quote:
Originally Posted by Lone Ranger View Post
The official answer from Subaru of America is: The spark plug used on the 2.5L engine has a platinum electrode, but the core is not platinum. Therefore, the replacement maintenance interval is 30,000 miles.
http://www.ngksparkplugs.com/pdf/dyk..._ignitions.pdf
Interesting. The OEM plug is NGK p/n FR5AP-11 (stock # 5463), which is a "Laser Platinum" plug. NGK says their Laser Platinum plug is the "Best Platinum spark plug available."

I wish these guys would get their stories straight...

My take is that the wasted spark explanation makes sense. The Turbo engine has four coils (one for each plug), and each plug fires once for every two engine revolutions. The 2009 non-turbo engine has two coils, and each plug fires twice for every two engine revolutions.

Each plug in the non-turbo engine is fired as many times in ~30K miles as is each plug in the turbo engine in ~60K miles.

The FB25 engine introduced in the MY2011 Forester is also coil-on-plug (four coils), and the plug change interval was extended to 60K miles.

Times certainly have changed. We have three vehicles, and between them, they carry 18 ignition coils.

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Jim / crewzer

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post #8 of 13 (permalink) Old 04-12-2014, 06:13 PM
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FWIW, my 2010X Premium came with laser platinums from the factory and it has the same 30,000 interval in the book.

Just pulled the most recent set today and they had 50,000 mi on them. Here's a photo if anyone is interested in their condition. The maximum gap I measured on these plugs is 0.040", well within the 0.039-0.043 service limits. IMHO, the service interval is way too low.


Last edited by Inspector; 04-12-2014 at 06:25 PM.
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post #9 of 13 (permalink) Old 04-13-2014, 09:28 AM
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Irridium. I put Autolite XP in my Focus 140k miles ago and they're still great. I just put them in the Forester a couple hundred ago. With how difficult subaru spark plugs are to change, why not put in plugs that last 100k?

I had my heart (and wallet) broken by a 03 XS
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post #10 of 13 (permalink) Old 04-13-2014, 10:39 AM
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Originally Posted by arbakken View Post
Irridium. I put Autolite XP in my Focus 140k miles ago and they're still great. I just put them in the Forester a couple hundred ago. With how difficult subaru spark plugs are to change, why not put in plugs that last 100k?
I believe that bc subaru has a "Wast Spark" irridium is not recommended. But in any event plats on the X are certainly able to do 60K miles plus. Really the X is not difficult to change.


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post #11 of 13 (permalink) Old 05-16-2019, 11:26 AM
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Originally Posted by crewzer View Post
The OEM plug is NGK p/n FR5AP-11 (stock # 5463),
So I'm reading this now...after already doing the work, which in hindsight, was dumb. Apologies if bringing up old posts is frowned upon.

The parts dude at Oreillys said that NGK 7090 (BKR5EGP) which are G-Power Platinum would work fine for my 09 non turbo Forester, but since changing all 4 plugs with these and wires (Import Direct set #40475) the car has had a rough idle/sputter when slowing down to come to a stop. First day it got so bad that right before the engine would clear up and idle right, some dash lights would blink on then off (can't recall which ones to save my life). The light show doesn't happen any more 3 days later, but it still sputters a little when stopping.

Should I go ahead and yank em out to put in the NGK 5463 Laser Platinums and see if the issue clears up? Or should I give the computer more time to adjust to new sparks?
Plugs last changed at ~69K miles. Car currently has 139K with a few hundred of those being on the new plugs.

09 Forester 4EAT Limited
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post #12 of 13 (permalink) Old 05-16-2019, 07:50 PM
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Though not the OEM plug NGK supplies to Subaru, NGK still lists the plug as correct for this application. I would double check your work and look for a problem with how you installed the plugs and wires or something that inadvertently happen when you installed the spark plugs and wires.
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post #13 of 13 (permalink) Old Today, 06:37 AM
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Update: The issue appears to have been resolved on its own. Engine no longer sputters.
I'm going to keep an eye on my gas mileage and see if it's any worse or stays the same as it was with the old plugs.
If all seems well, I'll still probably pull them and visually inspect them after 20K and see if they have any issues.

09 Forester 4EAT Limited
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