MaStaMooN Posted July 3, 2018 Share Posted July 3, 2018 So I recently had my car in the shop due to an issue with bucking/hesitation under anything but light driving at boost levels of about 5psi or higher. Shop wanted to do a compression test and ended up find my plug(s) pretty yucky, new plugs fixed the issue. One plug looked pretty bad, with the center electrode being pretty corroded. Is there anything telling from these crappy pictures the shop took? The compression test results were as follows: Cyl 1 - 140 psi Cyl 2 - 135 psi Cyl 3 - 135 psi Cyl 4 - 120 psi Which is amazing since the previous compression test/leakdown results 3 years ago were.. Cyl 1 - 127psi / 0% leakdown Cyl 2 - 130psi / 0% leakdown Cyl 3 - 127psi / 0% leakdown Cyl 4 - 129psi / 0% leakdown Jon - vBGarage Profile Link to comment Share on other sites More sharing options...
ArmyVetMP Posted July 3, 2018 Share Posted July 3, 2018 Suppose this is a good place to pose my Question. My Legacy 2.5i is 8 years old (2010 Legacy), Im a little over 198,000 miles on it currently and I believe the spark plugs have never been changed. I have no issues with the vehicle running, no power lag, no misfires, etc. What is the average life span of spark plugs? What brand is recommended to replace with? Link to comment Share on other sites More sharing options...
Max Capacity Posted July 6, 2018 Share Posted July 6, 2018 60,000 miles is the recommended mileage to replace the plugs. I have gone 80,000 miles before I had a misfire. I only put NGK's in my cars. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
DonnyJagaru Posted July 12, 2018 Share Posted July 12, 2018 Does 60,000 miles apply to NA 2.5i engines too? I just noticed mine is not idling as smoothly as per normal. Just re-read above, thanks. Link to comment Share on other sites More sharing options...
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