Northstar Engines and System Technical Discussion Discussion, It's been asked before, but more specifically.ACD 41-OEM Sparkplugs vs Denso Iridium in Cadillac Engine Discussion; Im at 109K miles....
Denso is the OEM for the N* double platinum spark plugs (AC Delco 41987 double platinums ...
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?
Re: It's been asked before, but more specifically.ACD 41-OEM Sparkplugs vs Denso Iri
Originally Posted by maeng9981
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).