IK16 (x4) Denso Spark Plugs


Condition: New
Brand: DENSO
Interchange Part Number: 06H905621A
Manufacturer Part Number: IK16
Other Part Number: 5303


For maximum performance under the most extreme conditions, you can’t go past DENSO Iridium Power spark plugs. Through patented technology, including a 0.4mm diameter centre electrode – the Iridium Power plug produces the hottest, most concentrated spark with the lowest voltage and outperforms any plug today.
It is no secret that Iridium is 6 x harder, 8 x stronger and could take temperatures of 650 degrees C hotter than platinum (i.e. exceeding 2454 degrees C).
Through patented technology, including a 0.4mm diameter centre electrode – the Iridium Power plug produces the hottest, most concentrated spark with the lowest voltage and outperforms any plug today.

The DENSO difference:

Iridium Power uses DENSO’s patented U-Groove ground electrode to achieve maximum ignitability while minimizing required voltage.
At 0.4mm in diameter, the DENSO Iridium Power center electrode tip is the world’s smallest.
Produces the hottest, most concentrated spark, while requiring the lowest voltage
Produces maximum performance under the most extreme conditions
Laser Welding
There wasn’t a welding tool hot enough to melt an iridium electrode tip to a nickel base. That is until DENSO pioneered their patented Laser Welding Process that provides a 360° seal so reliable the electrode resists wear even in the worst conditions.

Improved Firing Performance
To improve firing performance, the contact area between the electrode and the flame nucleus needs to be reduced in size. This is why the electrode was made as fine as possible to a diameter of 0.4mm. Compared to normal Spark Plugs, with a spark gap of 0.8mm, the ignitability limits are better by 2.5.

Lower Required Voltage
The required voltage in the Iridium Power plugs is between 3 & 5 kv less than normal plugs. This is due to the ultra-fine 0.4mm diameter ground electrode and U-groove design. Because required voltage is kept low, Iridium Power can be used in high performance engines and for high response driving.

Smoother Idling
When an engine is idling, firing can become particularly bad. Because Iridium Power plugs have a low required voltage and high ignitability, sparking continues to work properly during idling. Whereas normal plugs have highly variable revolution counts, Iridium Power plugs maintain very smooth idling. Also, because combustion is good, the explosive energy raises the revolution count.

Improved Engine Performance
Iridium Power spark plugs enhance the performance of an engine. Acceleration is improved when compared against normal spark plugs.

Decreased Fuel Consumption
When Iridium Power spark plugs are used, accidental fire and misfiring rarely occurs under various driving conditions. Therefore, combustion is extremely good. In turn, a healthy engine can be maintained and fuel consumption improved.


Sarbjit Pattnaik

It would not be enough how much I write about Peter/PMA autowork here, but I would try to give a complete honest review. Few days back I got an Audi Q7 V8 4.2l from one of the private seller, and you tell me its my error in judgement or bad luck, I got into major problems like engine shuddering and multiple fault codes from day 1. I banged different doors including Audi and got lot of heartache with unimaginable quotes and time to repair. Then out of nowhere I saw PMA autoworks popped up in nearby mechanic ads. Right from that time Peter took control of the situation and laid out a plan to approach this major issue, he was very very communicative at every step and diagnosed the issue (which was exactly as Audi found) and suggested to replace timing chains ( please note in Audi Q7 replacing timing chain is a complicated task as it sits behind the engine, so that means, engine along with other components need to come out), also he showed me few other components were faulty and recommended to replace. He provided me a genuine quote and along with provided me lot of assurance and confidence of handling this major issue. He delivered the car within two weeks along as he commited in beginning with one year manufacture warranty and lifetime warranty of workmanship. and voila two weeks gone my car is running as smooth as ever before and even after delivering the car Peter from his side followed up couple of times to understand my experience.

This in my experience should be called as text book definition of customer satisfaction which Peter and his team have showed in every point without charging mindless money. Thanks a lot Peter and team!!

Bui Manh Tuan

PMA has been the one-stop shop destination for all of my auto mechanical needs over the past two years. From installing a new sensor system to fixing an engine starter or periodic maintenance services, Peter and his team have delivered consistently excellent services at competitive prices. I appreciate Peter’s flexibility and efforts to accommodate customers’ requests. For an example, a month back, one of my cars failed to start. Needless to say, this got me very frustrated as I was about to drive to work in the morning. I called Peter and he did come to my garage after working hours to diagnose the problem. In the following morning, he came back to get it fixed by replacing the starter. I was very pleased with PMA’s agile, timely yet professional services. In addition, Peter always provides me with great consultation as to when things need to be done and what kinds of spare part/materials I should go with. This assisted me to work out a solution that suits my budget the most. In summary, I would highly recommend PMA auto for its great technical excellence and customer services and compettitive pricing.

Rachelle Flower

Peter is very honest, I did a bit of price research before I went of the head unit upgrade and his price is by far the best and the reviews on him is great. I was recommended by a friend and this company didn’t disappoint! The new touch screen console is fabulous. And soooo reasonable priced. Will be going back there to do window tinting.

Dennis Ho

Had my Audi A4 2.0L turbo engine fully rebuilt for a bargain and can feel the difference in the drive, also better fuel consumption has improved a lot as well. For a massive job it was done thoroughly but speedy. Would definitely recommend any services done through PMA. Fantastic work all round, thank you team!

Vu Tran

Been to PMA for services twice now and i am extremely happy with the services provided by Peter, as well as the PMA team.

Will definitely recommend PMA to my friends and colleagues!! Keep up the good work

Joe Wong

Peter was wonderful. He deserves a 5 stars, thank you very much by being honest by telling us that we could go back to car dealer for the sensor issue.

If you are after honest, professional and cost-effective services, PMA is highly recommended.

John Nathaniel Gureng Navarro

I always keep my cars in excellent condition with pma auto works. They also specialise with aftermarket parts. I service my mazda 6 and my Toyota 86 gti trd with them and both runs well and never had issue on it.they follow my service schemes manual on which need to inspect or replace so it’s the same service I get from but with a very less price.and the best thing is I get a drop off or a free loan car if I need to go to work.I highly recommend this to my friends and most of them do their car service here.

Jacky Caine

Feels good when you finally find that mechanic that you will always return to.
Fantastic business to deal with, good pricing & service was excellent. My car feels great and has so much more power haha
Peter and crew thank you so much

David Vu

PMA Auto Work is a best one-stop shop destination for auto mechanical in Melbourne Peter always gives me the good price – cheapest He takes care my 1991 Honda Civic EG and 2010 Holden Cruze JG very good

Ash Zakariah

Got my car fixed up after going to other claimed specialists. Peter and his team know their stuff and got it done. Keep up the good service. Highly recommended.

Tin Tran

Peter is an honest and trustworthy person. He knows his stuffs and always makes sure you leave happy. Highly recommended!

Mario Susatyo

Peter is my go to mechanic for any of my automotive stuff, highly recommended and always very positive experience..!!

AndrewandKaren Shepherd

Outstanding service and price – nothing is too difficult I would highly recommend them to you

Kunwar Virk

Best auto shop in Melbourne. I modded my wrx recently. With a valvetronic exhaust which was specifically designed and made by pma auto works. The car sounds beautiful all thanks to pma auto works and Peter. Prices are extremely cheaper than others and performance is what they deliver.

John Nathaniel Gureng

I live in Richmond, willing to drive 30mins to his shop for car service. Strongly count on these guys, they have big passion in cars. Good service, good advice and good price. Will recommend friends. Wish i can rate 10 stars