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Thread: It's been asked before, but more specifically.ACD 41-OEM Sparkplugs vs Denso Iridium

  1. #1
    mtflight's Avatar
    mtflight is offline Cadillac Owners Connoisseur
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    It's been asked before, but more specifically.ACD 41-OEM Sparkplugs vs Denso Iridium

    Im at 109K miles....


    Denso is the OEM for the N* double platinum spark plugs (AC Delco 41987 double platinums are EXACT same plug as DENSO PT16EPR13 aka 5092).

    As per the Denso site (http://goo.gl/TyKuB ), their Iridium plugs are compatible with the N*

    Rock Auto page for AC Delco 41-987 http://www.rockauto.com/catalog/moreinfo.php?pk=89945
    Rock Auto page for DENSO 5092 (same spark plug as above) http://www.rockauto.com/catalog/moreinfo.php?pk=993026

    Here's the Rock auto page for the Denso Iridiums: http://goo.gl/24G7u

    So what's your take? Not worth the extra dollars or not a noticeable upgrade? Reducing the load on something so repetitive would have some kind of advantage, or a fiasco like Bosch plugs in the Northstar?

    My reasoning is the original plugs are DENSO and these are DENSO too--not just a gimmick, same engineering.

    Also, would there be a noticeable improvement in MPGs with new plugs?

    Last edited by mtflight; 04-17-11 at 04:38 PM.

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    Ranger's Avatar
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    Re: It's been asked before, but more specifically.ACD 41-OEM Sparkplugs vs Denso Iri

    I seriously doubt you'd see any difference in mileage.

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    92Deville's Avatar
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    Re: It's been asked before, but more specifically.ACD 41-OEM Sparkplugs vs Denso Iri

    Stick with the factory recomendations and put another 100K on it.

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    mtflight's Avatar
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    Re: It's been asked before, but more specifically.ACD 41-OEM Sparkplugs vs Denso Iri

    Well they were only $12 more than the factory ones for the whole set. I'll report back if they fail to perform.

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    Re: It's been asked before, but more specifically.ACD 41-OEM Sparkplugs vs Denso Iri

    I just ordered 8 AC Delco 41-987 from ebay. ~$4 each. Trying to stick with AC Delco, proven...

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    mtflight's Avatar
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    Re: It's been asked before, but more specifically.ACD 41-OEM Sparkplugs vs Denso Iri

    Quote Originally Posted by maeng9981 View Post
    I just ordered 8 AC Delco 41-987 from ebay. ~$4 each. Trying to stick with AC Delco, proven...
    Yeah can't go wrong. That's what I was going to do, but since the AC Delcos are made by DENSO and according to them their Iridium is one up on their double platinums I took a chance for $1.50 more each than the AC Delcos. $3 more each than the DENSO label double platinums.

    I got them from retailer in case they are a fiasco, I can get a refund/exchange for the ACDelcos/stock DENSOS.

    I notice only the escalade is using Iridiums, all the Cadillacs still use the double platinums when I checked (I hope that's not a sign).

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    Re: It's been asked before, but more specifically.ACD 41-OEM Sparkplugs vs Denso Iri

    The Iridium plugs are a teeny bit less demanding on the coils and that is the advantage to them.

    If a Denso Iridium plug fits the spec. coil life maybe extended by using them. You really can't go wrong using the OEM plug.


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