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Re: Iridium vs Platinum [Re: kschachn] #5121242
05/31/19 11:54 AM
05/31/19 11:54 AM
Joined: Aug 2003
Posts: 830
ottawa
nicholas Offline OP
nicholas  Offline OP

Joined: Aug 2003
Posts: 830
ottawa
Originally Posted by kschachn
Yeah, that's really not possible. if you thought better throttle response then that was only imagined. Even with good non-platinum group metal spark plugs the performance is going to be identical.The only thing that affects "performance" is the gap and platinum group metals resist erosion better than nickel (or whatever is used in standard plugs).

The automaker likely uses platinum because they are somewhat cheaper than iridium and the longevity is similar.

Just telling you what I noticed.....when you drive a car everyday for hours you tend to notice these things.
It made a difference in throttle response the moment I took it for a drive after the plug swap. Nothing but plugs were changed.


2019 2.0T Santa Fe
2010 3.5 Santa Fe
Re: Iridium vs Platinum [Re: nicholas] #5121252
05/31/19 12:11 PM
05/31/19 12:11 PM
Joined: Sep 2007
Posts: 1,233
TX, USA
JMJNet Offline
JMJNet  Offline

Joined: Sep 2007
Posts: 1,233
TX, USA
How do you know that they don't put Iridium?

If you feel the need to replace it, then do it.


  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel


Re: Iridium vs Platinum [Re: JMJNet] #5121268
05/31/19 12:39 PM
05/31/19 12:39 PM
Joined: Aug 2003
Posts: 830
ottawa
nicholas Offline OP
nicholas  Offline OP

Joined: Aug 2003
Posts: 830
ottawa
Its platinum in the manual.

I came here to see if anyone knows why a platinum was used as an OEM plug......... Lots of conjecture and judgement but no real answer to my question...


2019 2.0T Santa Fe
2010 3.5 Santa Fe
Re: Iridium vs Platinum [Re: nicholas] #5121275
05/31/19 12:43 PM
05/31/19 12:43 PM
Joined: Mar 2017
Posts: 10,005
...
PimTac Offline
PimTac  Offline

Joined: Mar 2017
Posts: 10,005
...
Originally Posted by nicholas
Its platinum in the manual.

I came here to see if anyone knows why a platinum was used as an OEM plug......... Lots of conjecture and judgement but no real answer to my question...

I doubt anyone knows exactly why. Only Hyundai.

There is nothing wrong with platinum plugs.


2017 Mazda CX5
Havoline Pro DS 0w20
Roki OEM filter.
Re: Iridium vs Platinum [Re: nicholas] #5121276
05/31/19 12:45 PM
05/31/19 12:45 PM
Joined: Aug 2002
Posts: 15,250
Silicon Valley
PandaBear Offline
PandaBear  Offline

Joined: Aug 2002
Posts: 15,250
Silicon Valley
Originally Posted by nicholas
Hi Everyone,

We just bought a new turbo Santa Fe - 2019.
It has OEM platinum plugs - - - Just wondering if I can swap out those for some iridiums. They last longer and require less energy to spark.

Just wondering tf there is a reason for the plats - - - We had a 09 Audi that had platinums as well. I swapped those out for iridiums for better performance.

Do most turbo's require platinum plugs?

Thanks


1) Can you? Yes, but swapping out new platinum for iridium because it "last longer" now doesn't make sense. Why don't you wait till the miles are there (i.e. 60 or 90k).
2) Probably a "don't fix what's working" here on an older engine, the same reason why people don't switch everything to iridium with platinum disk on side electrode plugs, and people are still buying "copper" plugs. It cost a lot of R&D to certify emission and test something.
3) You can run anything that has the right firing voltage as long as you change them frequent enough. Most of the benefit is from the finer electrode size to make it easier to fire, or sharper new edges that has the same effect. For almost the same electrode diameter size, you won't see any improvement.


"You keep asking questions PandaBear and you'll end up a vegetarian like my wife" - Camu Mahubah
Re: Iridium vs Platinum [Re: PimTac] #5121277
05/31/19 12:46 PM
05/31/19 12:46 PM
Joined: Jan 2004
Posts: 5,356
California
nthach Offline
nthach  Offline

Joined: Jan 2004
Posts: 5,356
California
Originally Posted by PimTac
There is nothing wrong with platinum plugs.

++.

I wouldn't lose sleep over it. Change the plugs at Hyundai's recommendation or when you see the CEL blink and P030x misfire codes are present for troubleshooting.

Re: Iridium vs Platinum [Re: nicholas] #5121278
05/31/19 12:47 PM
05/31/19 12:47 PM
Joined: Dec 2005
Posts: 11,686
Upper Midwest
kschachn Online content
kschachn  Online Content

Joined: Dec 2005
Posts: 11,686
Upper Midwest
Originally Posted by nicholas
Its platinum in the manual.

I came here to see if anyone knows why a platinum was used as an OEM plug......... Lots of conjecture and judgement but no real answer to my question...

Again, there is no performance difference between the two. If you perceived one then it was due to one being worn and the other one being new.

They use platinum plugs because they are less expensive than iridium and they are acceptable for use to achieve the specified replacement interval in the owner's manual (and emissions warranty requirements). No other reason.

My two Toyota cars specify platinum plugs and both go the 90,000 or 100,000 mile interval without problem. I could use an iridium plug instead but I really don't want to leave them in the head any longer from personal fear of seizing.


1994 BMW 530i, 242K
1996 Honda Accord, 277K
1999 Toyota Sienna, 418K
2000 Toyota ECHO, 281K
Re: Iridium vs Platinum [Re: nicholas] #5121299
05/31/19 01:15 PM
05/31/19 01:15 PM
Joined: Oct 2014
Posts: 1,520
NoVA
Jimzz Offline
Jimzz  Offline

Joined: Oct 2014
Posts: 1,520
NoVA
Originally Posted by nicholas
Its platinum in the manual.

I came here to see if anyone knows why a platinum was used as an OEM plug......... Lots of conjecture and judgement but no real answer to my question...

Iridium is in the Platinum group. That and iridium plugs are iridium on the tip and platinum on the ground.


yup
Re: Iridium vs Platinum [Re: nicholas] #5121301
05/31/19 01:21 PM
05/31/19 01:21 PM
Joined: Aug 2017
Posts: 687
Cincinnati, USA
Dave9 Offline
Dave9  Offline

Joined: Aug 2017
Posts: 687
Cincinnati, USA
Platinum is used because it works acceptable for the warranty period. Platinum works equally well as a fine wire plug except does not last as long as a fine wire iridium.

Since you don't get to pick which plugs come from the factory, you should consider how often you are going to replace the plugs. If the vehicle burns oil for example you are going to need a shorter replacement interval and may be wasting money on iridium. If it does not, it is arguably worth using iridium on the first plug change.

On subsequent plug changes, 2nd/3rd/etc, I'd just go platinum fine wire and change them more often. It's good not to leave them in too many years so they aren't seized in place and to examine for hints of an engine problem. At least that is my strategy, I tend to get newer vehicles every few years so the older a vehicle gets the fewer miles are put on per year so the more years before X # of miles would otherwise wear out spark plugs, then with either type it has been long enough that I'm replacing the wires while I'm at it, and on some vehicles with a coil on each plug, it may be time to replace the coils too... replacing something old before it fails can be cheaper than a tow, but of course there is only so much it's reasonable to do but I'm talking about well over 100K mi by that point.

Last edited by Dave9; 05/31/19 01:23 PM.
Re: Iridium vs Platinum [Re: nicholas] #5121401
05/31/19 02:49 PM
05/31/19 02:49 PM
Joined: Aug 2017
Posts: 222
Displaced Texan in Mexico City
Gimpy1 Offline
Gimpy1  Offline

Joined: Aug 2017
Posts: 222
Displaced Texan in Mexico City
Why are you trying to out engineer the engineers? Its a brand new vehicle leave it alone don't fix what isn't broken and simply follow the owners manual. If you switch to a different plug it may invalidate your warranty. Throttle response can be affected by a ton of things from the TPS all the way to the shape of the throttle body and intake.

Last edited by Gimpy1; 05/31/19 02:49 PM.
Re: Iridium vs Platinum [Re: nicholas] #5121437
05/31/19 03:20 PM
05/31/19 03:20 PM
Joined: Jun 2002
Posts: 13,132
The Motor City
Kestas Offline
Global Moderator
Kestas  Offline
Global Moderator

Joined: Jun 2002
Posts: 13,132
The Motor City
Originally Posted by nicholas
I came here to see if anyone knows why a platinum was used as an OEM plug......... Lots of conjecture and judgement but no real answer to my question...

You want to know why platinum was used versus what?... iridium?, or regular untipped plugs?

Re: Iridium vs Platinum [Re: kschachn] #5121452
05/31/19 03:38 PM
05/31/19 03:38 PM
Joined: May 2008
Posts: 2,428
Parts Unknown
UG_Passat Offline
UG_Passat  Offline

Joined: May 2008
Posts: 2,428
Parts Unknown
Originally Posted by kschachn
Originally Posted by UG_Passat
The spark plug makers did find decreased center electrode diameter requires less energy to spark and produced a "more concentrated" spark for a better start of the flame kernel.

It is about geometry. Iridium has a much higher melting point than platinum and as a result the electrode can be made smaller despite poorer overall heat conduction.

It's not about heat conduction. That is a property of the heat range of the plug, defined by the geometry. Iridium alloy is expensive and not as good as a conductor, so the tip is small for cost, and it's only the tip. The rest of the core is still nickel alloy. The byproduct of the reduced diameter is less energy to spark and a "more concentrated" spark (in laymen's term).


2016 VW Tiguan|APR Stage 1|Neuspeed P-Flo|Osram CBI|Redline 5w30
Re: Iridium vs Platinum [Re: UG_Passat] #5121532
05/31/19 05:00 PM
05/31/19 05:00 PM
Joined: Dec 2005
Posts: 11,686
Upper Midwest
kschachn Online content
kschachn  Online Content

Joined: Dec 2005
Posts: 11,686
Upper Midwest
It is about heat conduction, a small tip is desirable for several reasons and that isn't achievable with a standard nickel electrode. The heat cannot be conducted away fast enough and it will melt, but this won't happen with a platinum group metal.

The one thing it is not about is electrical conductivity. The overall electrical resistance of the plug is far higher than anything going on at the tip. Besides, all the platinum group metals are excellent electrical conductors.


1994 BMW 530i, 242K
1996 Honda Accord, 277K
1999 Toyota Sienna, 418K
2000 Toyota ECHO, 281K
Re: Iridium vs Platinum [Re: Gimpy1] #5121909
06/01/19 06:21 AM
06/01/19 06:21 AM
Joined: May 2019
Posts: 723
WA
Mad_Hatter Offline
Mad_Hatter  Offline

Joined: May 2019
Posts: 723
WA
Originally Posted by Gimpy1
Why are you trying to out engineer the engineers? Its a brand new vehicle leave it alone don't fix what isn't broken and simply follow the owners manual. If you switch to a different plug it may invalidate your warranty.


If the design engineers felt the cost to benefit favoured iridium, I'm guessing they would have put them in there. Especially when you consider putting in iridium at the factory isn't exactly going to move the production cost all that much. That said, if the marketing dept thought they could charge $10k more for the vehicle because it has iridium plugs, they'd push for having them in there.πŸ˜‚

But hey, it's your car now and your money... you do you! It's a waste of money IMO, but you know what they say about opinions..πŸ˜‰

Last edited by Mad_Hatter; 06/01/19 06:22 AM.
Re: Iridium vs Platinum [Re: nicholas] #5121962
06/01/19 07:49 AM
06/01/19 07:49 AM
Joined: Dec 2017
Posts: 4,619
SE British Columbia, Canada
Snagglefoot Online content
Snagglefoot  Online Content

Joined: Dec 2017
Posts: 4,619
SE British Columbia, Canada
Why are you old boys talking about Platinum and Iridium? Ruthenium is where it’s at! LOL banana


If you want the job done right......do it yourself.
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