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Old 05-18-2018, 12:47 PM   #1
trdehmer
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Join Date: Mar 2014
Location: MN
Vehicle:
2012 WRX

Default 2012 WRX - what spark plugs to get??

I plan on swapping out the spark plugs in my 2012 Impreza WRX - what brand and model/part number should I get if not going through the dealer?

Thank you!
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Old 05-18-2018, 01:12 PM   #2
Charlie-III
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Join Date: Dec 2002
Chapter/Region: Tri-State
Location: USA, North NJ, 07456
Vehicle:
1998 Legacy 2.5GT
Silver Sleeper BK, 5MT

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I prefer NGK in Asian imports.
Stick with type.....e.g.: if Iridium, stay with Iridium. Unless racing, no need for $15/ea plugs......

Higher miles NA I do NGK coppers, partly due to oil burn and I want to keep an eye on the plugs.....so, cheap to buy and replace more often.

If you are upping your boost, you "may" want to go a step colder.
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Old 05-18-2018, 01:18 PM   #3
trdehmer
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I have 62,000 miles on it. Dyno tuned (around 17-18lbs of boost) with stock spark plugs which I believe are the NGK SILFR6A (7913).

So, I'm guessing I want to stick with stock heat range spark plugs?
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Old 05-18-2018, 01:36 PM   #4
Samurai Jack
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2002 Enemy of Aku

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I like NGK. Never had an issue with that brand.

Stick to stock plugs unless you have done a lot of power mods to the car.
General rule of thumb:
- Change to 1 range colder plug for every 100HP increase in power.

So, if the car is stock, and you had it dyno tuned for better efficiency, you probably only need the stock plugs.
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Old 05-22-2018, 06:56 AM   #5
marxlenin
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what's the typical mileage of the car to switch plugs? I have a 12' WRX as well.. 60k miles
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Old 05-22-2018, 11:52 AM   #6
Samurai Jack
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Last time I looked at an Owner's manual, with OEM plugs, the interval was 60,000 miles.

What does your Owner's manual say?
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