Dual platinum and iridium sparkplugs vs. standard

[SteveSRT8]

Originally Posted By: wtd
Both of my 98 Chevy trucks came with double platinum's from the factory. The problem with AC-Delco's double platinum plugs is that the platinum disc on the side electrode tends to fall off over time. I don't like the thought of these discs falling down into the combustion chamber plus it widens out the gap.

I now have AC-Delco single platinum Rapidfire plugs in both trucks but I'm going to try the AC-Delco iridium plugs in the 98 K3500 here soon since it's due for a plug change. I'm not sure how it will run but I'm going to give it a try. Wayne


Wayne,

IME here with GM V8's there will be zero issues. Plus the new plugs are nearly permanent. I have run them out to 250k miles with no loss of mpg, performance, etc. They are great...

 

[SteveSRT8]

Originally Posted By: slacktide_bitog
No real downside, except the extra cost.

Always use iridium when the plugs are hard to access, if available for your engine, because that way you won't ever have to change them again!


Exactly. On the 300C forums everyone is always in a tizzy about copper plugs. The recommended interval is 30k miles. Yet the 5.7's run fantastic on Plat/Irid hybrids.

I have told many 5.7 owners "pick your plug by how often you want to change it"...

 

[demarpaint]

I use the NGK Laser Platinum plugs in my 08 Liberty, as per Trav's recommendation. I swapped them out at 35K miles. The OE copper plugs were OK, but the interval is every 30K miles. The 08 Liberty has to be one of the easiest engines to change plugs on, especially after changing them on my 00 Century. I should be able to get twice the life maybe more from these. For the price I paid for them at Pep Boys during some online special they had it was a no brainer.

 

[DBMaster]

Mazda put out a TSB on spark plugs shortly after launching the "Skyactiv" drivetrain. It highly recommended using only plugs with iridium center and platinum ground electrodes to obtain satisfactory performance. It's a DI engine with 12:1 compression (2012-2013) and 13 or 14 to 1 currently.

 

[wtd]

Originally Posted By: SteveSRT8
Originally Posted By: wtd
Both of my 98 Chevy trucks came with double platinum's from the factory. The problem with AC-Delco's double platinum plugs is that the platinum disc on the side electrode tends to fall off over time. I don't like the thought of these discs falling down into the combustion chamber plus it widens out the gap.

I now have AC-Delco single platinum Rapidfire plugs in both trucks but I'm going to try the AC-Delco iridium plugs in the 98 K3500 here soon since it's due for a plug change. I'm not sure how it will run but I'm going to give it a try. Wayne


Wayne,

IME here with GM V8's there will be zero issues. Plus the new plugs are nearly permanent. I have run them out to 250k miles with no loss of mpg, performance, etc. They are great...


I did install these iridium plugs in the K3500 and they work fine. I bought another set to install in the K1500 even though I just recently put in another set of Rapidfires.

Wayne

 

[SHOZ]

All plugs are copper core. What people call copper is nickle plated electrodes.

I use the Twin Tip Denso and NGK iridium. Change them at 100k.