az645 Posted May 15, 2018 Share Posted May 15, 2018 My 2011 3.6R has 120K on it, when does one recommend replacing the spark plugs, they are the original, I notice no issues with the vehicle. Also what plugs are recommended? Link to comment Share on other sites More sharing options...
Timothy.B Posted May 15, 2018 Share Posted May 15, 2018 All your questions may be answered here: http://legacygt.com/forums/showthread.php/3-6r-spark-plug-replacement-256538.html Except for how long before replacing them. I believe Subaru recommends every 60k miles. The Laser Iridium I think are good for they say, 100k miles but 40-60k seems more ideal. At your mileage, I'm surprised you're not getting misfires. Timothy.B's 2011 LEGACY 3.6R Link to comment Share on other sites More sharing options...
FLlegacy Posted May 15, 2018 Share Posted May 15, 2018 I wouldn't be in a rush if there isn't an issue but I would definitely get it scheduled. I changed our tribecas plugs twice and neither time were they actually needed. 1st change 108k miles, 2nd change 165k miles. Link to comment Share on other sites More sharing options...
YeuEmMaiMai Posted May 16, 2018 Share Posted May 16, 2018 use the same brand ones that came out of it. Link to comment Share on other sites More sharing options...
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