Hey, i would recommend NGK wich is OEM

 

Go with an NGK Irridium. That is factory.

 

Now this is interesting. I wonder why other plugs get fitted . Must be the price.

 

If its a o4 V8, you have the Bosch 4 plugs which are OEM.

I tried the new NGK Iridium IX plugs which did work fine but i noticed the engine didnt feel as torquey and i wasnt getting the same mpg, not sure if its due to the single electrode verse the multi electrode design of the oem plug but i would stay away from the single electrode NGK.

 

i pulled out the 4 prong plugs and replaced with NGK and saw an increase in MPG.

the 4 prong plugs to me just dont make any sense, you are not getting 4 times the spark, you only get one spark and it goes the path of least resistance. Use a metal like Platinum and build a good plug and it will outperform the quad fire junk.

side note, i use NGK iridium on my 400hp 4cy turbocharged nissan and its the only plug that wont blow out at higher turbo pressures and lasts over a year. Other plug brands i had to change when i changed my oil.

 

i pulled out the 4 prong plugs and replaced with NGK and saw an increase in MPG.

the 4 prong plugs to me just dont make any sense, you are not getting 4 times the spark, you only get one spark and it goes the path of least resistance. Use a metal like Platinum and build a good plug and it will outperform the quad fire junk.

side note, i use NGK iridium on my 400hp 4cy turbocharged nissan and its the only plug that wont blow out at higher turbo pressures and lasts over a year. Other plug brands i had to change when i changed my oil.

+1... Same here in principle.. those 4 prong deals simply block more of the fuel at the combustion event... I've got a good book on ignition design, and the Denso ones are slightly better designed... I tried various plugs in my over boosted 4 banger too, and the Denso's were the only ones that didn't blow out (didn't try the NGK)... I'm able to run .044 gap and at least 25lb of boost.

 

In my opinion, Volkswagen/ Audi, installed the Bosch 4 ground plug from the factory for a reason.

If the engine produced more power, torque with a single ground, iridium plug while still providing longevity, they would've used it. They have highly paid and trained engineers who sit around testing these theories for a living. I'll follow their guideline and recommendations.

Of course, emissions has a lot to do with it as well I'm sure and maybe the Bosch plug provides a cleaner burn? It does not appear to be an issue of cost as the Bosch plugs are pricey themselves.

For me, I'll stick with the Bosch 4 ground units as they have worked just fine providing power, longevity, and help control pinging as well.

 

Yeah, the reason is, it met minimum requirements and was cheap. I work for an auto Mfg. Any product is designed to a series of compromises. A well informed consumer can modify the product to improve certain aspects to that customers taste and achieve better results in some cases than the engineers who are working under a completely different set of constraints.... Its like saying if Audi could reliably got 350hp out of the 1.8T, they would have done it... Well, I did, and a 110k later, its still going strong - PS, the Denso Iridium plugs are the only ones that work in that.....

 

I used the NGK Iridiums on my past BMW custom turbo, and felt a real difference at higher boost in power delivery.
On the Touareg I switched over to the Iridiums for experiments sake, but didn't feel any difference at all. I probably would if the engine was modified meaning supercharged.

JRiffe108 does make a good point though, although it must be said that the NGK Iridium ix plug was not officially introduced until 2000, and the Audi V8 engine was already R&D developed by that time.

 

Well, very little will give you a "seat of the pants" difference, especially something like spark plugs. Also, you have to take advantage of the improvement iridiums offer - that is, if you use a cheap copper and a expensive iridium at the same gap, all you gained is longevity... The Iridiums will tolerate a much wider gap, which has small, but measurable gains. My factory plugs seem to have been gapped around .032. I put the iridiums in at .040... we'll see what happens.. I'd have tried .045, but my gauge didn't go that big. (yes, you can gap iridiums, but you have to know what you are doing).

 

PS, the Denso Iridium plugs are the only ones that work in that.....

I didn't catch this part. You are saying Denso is better than NGK in the Iridium department?

 

Well, they have several small design improvements. Maybe not enough to justify the price difference, but still worth it to me. You also need to gap them big to see any real advantage. I've found that VAG products will tolerate .045 pretty easy, though that exposes weak coil packs pretty quickly! (not that I've had any bad ones on the Touareg, but plenty on my 1.8t motors)...

 

Those 4 prong spark plugs are designed for longevity. Like 80000 km when one electrode wears out spark jumps to another and - like having 4 x life of single prong copper plug. They are much cheaper then iridiums hence why they used them. Densio had thinnest tip of all iridiums thus many like it (only 0.1mm diff). I have put NGK iridiums in my v8 and I am very happy. Smoother idling and better acceleration. Did not notice mpg difference.

 

^^ X2. I put the NGK Iridiums in my V8 as well. No diff in gas mileage, but definitely seemed more peppy.....of course, new plugs will do that.

 

Just changed out my 4 prong Bosch for the NGK iridiums last night. Surprisingly the easiest change-out I've had with plugs on a vehicle. My Bosch looked alright; I changed them out since its recommended at the 40k on a 04.

 

Hi, I'm looking at replacing the Bosch 7406 OEM plugs for my 60,000 mile service. Amazon shows the Bosch 9610 Iridium plugs are compatible with the Touareg 4.2 V8 engine and were released in 2011. Wonder if this new plug has been installed by other members?
The Bosch 9610 plugs have a $2.00 rebate, which lowers the cost to a ridiculous $4.59 each.

 

Hey guys I picked up a 2007 v6 Touareg in December with 60,000 miles and I want to replace the plugs, do I have to worry about changing the coils also or should everything come apart easily.
THANKS

 

NGK Iridiums, I just replaced mine and it feels like I gained 50hp. And my engine noise at idle went down 50%. I guess I was in due very badly for a plug change. I don't think the ones I had were iridiums, they were the basic VW branded ones.

 

I see both the Bosch and NGK part numbers in the manual for my V6. However, when the plugs were pulled they were NGK Laser Iridiums with the VW name on there.

I would use what the manual says, which should be Bosch for the V8? NGK does not show an OEM plug in their e-catalog, but I suppose you can use their Iridium IX as others have.

 

I use Denso iridiums. Slightly better then NGK but don't last as long. Got them at autozone on special for $6.5 each.

 

If you value performance over a long lasting plug.. Go with those Denso's. They don't last as long as NGK's. Why? It is a finer .4mm tip on the Denso vs the NGK at .7mm.

It may pay to experiment with heat range for those limited to 91 octane might want to go one heat range colder, read the plugs and use VCDS data logging to see if knock data goes down immediately and if it adapts over time to allow more ignition advance.

Sometimes a plug heat range change helps with less than perfect fuel being available.

 

Bosch!

 

I'm not sure who you're talking to since it's been almost a decade, but plugs have specs that are important. So it kinda depends on what you're doing and why. LL plugs are usually used from factory so that they don't need replacement for 100k