pearlm30 Posted February 17, 2009 Share Posted February 17, 2009 I am about to do some tune up for MY 95 legacy. I usually replace the spark plugs with V power NGK, but I have an extra set of iridium spark plugs that no longer needed from my SVX( same spark plug size as 95 EJ22 ). I heared somewhere that V power burns the fuel air mixture better. but iridium last longer. Which one has better fuel mileage and performance? Any advice??? Thanks Quote Link to comment Share on other sites More sharing options...
Subaru_dude Posted February 17, 2009 Share Posted February 17, 2009 I have iridiums in my car. They're overkill. Just get V-powers. You can only make a Legacy run so well. Quote Link to comment Share on other sites More sharing options...
bulwnkl Posted February 18, 2009 Share Posted February 18, 2009 There is NO reason in the world to not use "free" iridiums you have on-hand rather than buying another set of plugs. While V-Powers are adequate in all respects, the iridiums actually have a better opportunity to ignite the fuel-air mixture 'better' and thus have it burn more completely. They also last vastly longer. Whether you'll see a monetary payoff sufficient to cover the higher price is almost impossible to tell except under lab-grade controlled conditions, but since yours are "free," you'd be foolish to not use them. Quote Link to comment Share on other sites More sharing options...
nipper Posted February 18, 2009 Share Posted February 18, 2009 They all are overkill except for what sooby specifies, but for free, try them. nipper Quote Link to comment Share on other sites More sharing options...
Subaru_dude Posted February 18, 2009 Share Posted February 18, 2009 Oh didn't even realize they were free. DOH!! Yes, USE THEM. Quote Link to comment Share on other sites More sharing options...
pearlm30 Posted February 18, 2009 Author Share Posted February 18, 2009 OK, thanks for all the suggestions! I will give it a go. Are they 100,000 miles plugs? I only use regular 87 gas for the legacy, will report back if any gas mileage or performance increases. Quote Link to comment Share on other sites More sharing options...
bulwnkl Posted February 18, 2009 Share Posted February 18, 2009 If they're the double-iridium NGKs then they can last 100,000 miles. As it happens, I replaced mine at a bit less than 100k, but they showed no visible signs of needing replacement and there was no mpg improvement after I replaced them. I replaced them w/V-Powers because I'm cheap. Quote Link to comment Share on other sites More sharing options...
nipper Posted February 18, 2009 Share Posted February 18, 2009 If they're the double-iridium NGKs then they can last 100,000 miles. As it happens, I replaced mine at a bit less than 100k, but they showed no visible signs of needing replacement and there was no mpg improvement after I replaced them. I replaced them w/V-Powers because I'm cheap. i run the stock plugs over 100,000 miles all the time. nipper Quote Link to comment Share on other sites More sharing options...
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