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-   -   Replace spark plugs at 30,000??? (http://legacygt.com/forums/showthread.php?t=174398)

goldendeal 11-15-2011 10:42 PM

Replace spark plugs at 30,000???
 
Subaru has "replace spark plugs" at their 30,000 mile service. Every mechanic I talk to outside of Subaru tells me this is not necessary. I have friends that are owner of Toyota and Nissans to look in their manual at they tell me it’s recommended at around 70,000. When it’s time for my 30,000 mile I will ask if I choose not to replace them, will it affect the rest of my warranty. I feel change of spark plus at 30,000 mile is overkill. Plus the fact a couple dealerships in my area recently got busted for saying they replaced the spark plus but didn’t, just told the customers they did, how would you ever know unless you pulled them yourself to look? I’m not saying the Subaru dealership would do this, but the fact is you would never know if they did or didn’t change them.

Gire 11-15-2011 11:30 PM

Very strange. The 05 LGT suggests replacing the plugs at the 96K KM major service. Which is like 60K miles....

Rutchard 11-16-2011 02:16 AM

The manual says 60k for "2.5L Legacy/Outback; 3.0L, 3.6L, & Turbo" 30k for "All others"

Sounds to me like the 2.5i, 2.5 GT, and 3.6R all fall under the first category.

BAC5.2 11-16-2011 03:35 AM

2.5i's need them at 30k.
GT's and 3.6R's need them at 60k.

10legacy 11-16-2011 04:57 AM

The maintenance section in the manual says this:

Spark Plugs- all Outback/Legacy; all turbos; all 3.6L 6 cylinder engines at 60K miles.

Spark Plugs- Impreza, Foresterall except turbos (see below) at 30K miles.

This is from a 2010 legacy manual.



3.6subie 11-16-2011 07:58 AM

My dealer confirmed 3.6r spark plugs are good for 60k miles. They are gold or platinum tiped...I forget, but that gives them a longer life span.

Peaty 11-16-2011 09:19 AM

1 Attachment(s)
I've had this for a while but I believe the reasoning is still valid.

10legacy 11-16-2011 09:32 AM

Quote:

Originally Posted by Peaty (Post 3634759)
I've had this for a while but I believe the reasoning is still valid.


This may be true up until 2010, in the 2010 service schedule says all legacy's and outback's are 60k for the plugs. The impreza and forester are still 30k for non-turbo engines.

The 2009 service schedule says:
Spark Plugs 2.2L engine every 30K

Spark Plugs 2.5L engine every 30K

Spark Plugs, all Turbo 2.0/2.5 and
3.0/3.6L 6 cylinder engines every 60K

Here is the 2000-2009 Service Schedule:
http://www.cars101.com/subaru/subaru_maintenance.html

Here is the 2010+ Service Schedule:
http://www.cars101.com/subaru/subaru_maintenance1.html

Peaty 11-16-2011 09:37 AM

I was just showing the reasoning, it seem to be due to the type of plug in conjunction with the type of motor. Single VS double plat type.

Blizzard 11-16-2011 10:29 AM

I've been thinking about this recently especially with a pro-tune in mind. It might be a good idea to swap out the OEM plugs for something a bit colder since typically a colder plug will help prevent detonation from the increased heat a motor see's from higher boost levels.

I've gone to a colder plug with my LS motor and will be stepping up to even colder plug once the heads/cam build is done and maybe some nitrous is added into the mix. It doesn't make sense that Subaru's EJ motors would be immune to needing a similar upgrade. People on NASIOC don't really seem to know what to think.

http://forums.nasioc.com/forums/showthread.php?t=518633

Rutchard 11-16-2011 11:33 AM

Quote:

Originally Posted by Blizzard (Post 3634915)
I've been thinking about this recently especially with a pro-tune in mind. It might be a good idea to swap out the OEM plugs for something a bit colder since typically a colder plug will help prevent detonation from the increased heat a motor see's from higher boost levels.

while true with a modified car, I doubt a stock Legacy needs to worry about changing the plugs before 60k

BAC5.2 11-16-2011 11:35 AM

There is never any reason for a step-colder plug in a Subaru.

Rutchard 11-16-2011 01:03 PM

http://img.photobucket.com/albums/v3...orn_smiley.gif

minuccims 11-16-2011 01:11 PM

Recently changed plugs around 44k miles. From 42k, had noticed a drop in power.

stage 2 does not need colder plugs. If it did, they would have been changed for protune. We would have been discussing this for a year...

PKs17 11-16-2011 02:08 PM

Stop taking your car to "other" mechanics. This is how you get into trouble.
If you have a turbo model, then yes, its every 30K miles, and oil changes at every 3500 miles. Turbo motors require more frequent maintenance.


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