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I have a 2016 LT, my manual call for the AC Delco 41-123, auto parts store sells only one reccomended (per salesperson) 41-156. Plug out of car is 41-123. AC Delco web site says 41-123 is an invalid number. Could someone please tell me what I'm missing here?
 

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I have a 2016 LT, my manual call for the AC Delco 41-123, auto parts store sells only one reccomended (per salesperson) 41-156. Plug out of car is 41-123. AC Delco web site says 41-123 is an invalid number. Could someone please tell me what I'm missing here?
On the online owners manual 2016 cruze page 336 it shows Acdelco 41-153
Screenshot 2019-09-18 at 9.50.01 AM.png
 

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Discussion Starter #6
Yep, I did..... the Lady there had nothing on it either.... I'm going to go down there, in the Cruze . Kind of crazy.
 

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ACDelco has been changing Spark plugs numbers. Check Rockauto.com and gmparts direct. See what they say there are more current than the owners manual Rockauto shows 41 153.
 

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I pulled the plugs at around 25K miles to take a look at them and I can confirm the 41-123 number.

Rock Auto lists a 41-153 & 41-156 plug. I can't find any info. on either of them online. I suspect maybe they are different heat ranges (??), or the 156 supersedes the 153 ( ?? ).

I would go with the 156 myself and at Rock Auto it costs a little less than the 153.

I just sent an email to AC Delco asking them what the difference is. Hopefully I'll get a reply in the next few days.
 

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After doing more research, it looks like the difference is that the 41-156 plug is pre-gapped and the 41-153 isn't.

I entered my VIN at the AC Delco website and both the 41-153 & 41-156 were listed for my VIN. The 41-156 is noted as pre-gapped , but the 41-153 isn't noted as such.
 
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