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Going back to Stock Plugs for my 2012 cruze,over the performance plugs.., and Rock Auto Claims that the OEM 41-121's are the correct for 2012.. A few years ago it was the 41-122's and now I see 41-153's for the 2016/2017's... What the difference between these plugs now?
 

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41-121 is the correct plug I have it in my 2012 Eco and runs fine . The diff between the 121 and 122 would probably be the heat range, Never heard of the 122 or the 153. I know when I first changed mine, Delco was in the process of renumbering the plugs an 121 is now the correct one. I would say the 153 is a renumbered 121 for 2016/17 like the 121 was going from 2011 to 2012 from the 111 that was in my 2011. But if you get the 121 you have the correct plug for the 2012.
 

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2014 LT program car, Pull Me Over Red, 1.4T Auto
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2014 LT program car, Pull Me Over Red, 1.4T Auto
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The 153s are for the 2nd generation Cruze.
 
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