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Discussion Starter · #5 ·
Mine car had ACDelco 41-121 but the 2014 uses AC Delco 4-122 and the book calls for AC Delco 41-117 in my 2013 Cruze.
 

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Discussion Starter · #6 ·
My car had ACDelco 41-121 but the 2014 uses AC Delco 4-122 and the book calls for AC Delco 41-117 in my 2013 Cruze. There has to one reason they are different part numbers GM does not have different numbers just to have different numbers. And I find it strange that my 2013 Cruze eco which only has 3500 miles on it and not having the plugs that as called for in it.
 

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Sonic calls for 41-122. My 2014 Eco OM also calls for 41-122. However when I pulled the factory plugs they turned out to be 41-121 from Lordstown... shrug.

At any rate, here's how they cross reference to NGK...
41-121: NGK #IFR7X7G
41-122: NGK #IFR6Z7G

 

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Administrator, Resident Tater Salad
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Sonic calls for 41-122. My 2014 Eco OM also calls for 41-122. However when I pulled the factory plugs they turned out to be 41-121 from Lordstown... shrug.

At any rate, here's how they cross reference to NGK...
41-121: NGK #IFR7X7G
41-122: NGK #IFR6Z7G
Ahh, so they dropped a heat range just as we suspected to deal with the hestiation problem when hot!
 

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First off the AC Delco plug is a camouflaged NGK plug. Look right around where the washer is there is actually an NGK part number. The 41-117 is an old plug number superseded by the 41-121 or 41-120. I ran into the same thing with my 2012 Eco. Most places you buy plugs they will come in AC Delco boxes but actually be NGK Plugs. They are the same. I bought from Rock Auto and was sent a set of AC Delco plugs in AC Delco boxes. I don't know about the diff between the Sonic and Cruze tho. The biggest difference in all the numbers is heat range.
 
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