What is the heat range rating on this plug?

Here is a comparable heat range chart: https://www.densoproducts.com/learning-center/article/225/heat-range-conversion-chart, obviously this is a 20 plug.

Are these denso (4709) iw20tt spark-plugs delivered "pre-gapped" to the customer?

As in any spark plug (SP) user, you should always check the gap. The same SP could be used in different engines and/or applications. So, BE EXTRA CAREFUL GAPPING these SP because the center electrode is .040 in dia. Will snap off very easily. I put them in a vice with vg light and carefully gap to what I need. I use non-nickel anti-seize on the threads whether the heads are aluminum or CI. Torque to factory specs. Good luck

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DENSO Iridium TT Spark Plug - IW20TT - Twin Tip - The Powerful Premium Quality Ultra-Efficient Replacement Plug Fits Fiat Mercedes-Benz Honda MG Nissan Porsche Renault Subaru VW Hyundai Daewoo Lotus

Product ID: 58843717

Details

Brand
Denso
Core material
Iridium
Thread size
14 millimeters
Top material type
iridium
Vehicle service type
Car Van

⚡φ0.4mm Iridium center electrode

🔥Twin Tip design for max power

🔩14mm diameter, 19mm thread length

₨525

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Description

⚡ Ignite Performance, Drive Distinction.

TWIN TIP TECHNOLOGY - Double needle electrode accelerates flame kernel growth, unlocking your engine’s full power potential.
PRECISION IRIDIUM CORE - Ultra-fine 0.4mm iridium electrode reduces spark voltage for superior ignitability and efficiency.
LASER WELDED DURABILITY - All-around laser welding ensures unmatched reliability even under extreme driving conditions.
WIDE VEHICLE COMPATIBILITY - Fits premium brands like Mercedes-Benz, Porsche, Honda, VW, and more — upgrade your ride with confidence.
ELECTROMAGNETIC NOISE SHIELD - Built-in monolithic resistor eliminates interference, protecting your vehicle’s electronics seamlessly.

The DENSO Iridium TT IW20TT spark plug features a cutting-edge twin tip design with a 0.4mm iridium center electrode and 0.7mm platinum ground electrode, delivering faster ignition, improved fuel economy, and enhanced engine longevity. Precision laser welding and an embedded resistor ensure durability and noise-free operation, making it the premium choice for a wide range of vehicles including Fiat, Mercedes-Benz, Honda, Porsche, and VW.

Specifications

ASIN	B00TPUA6I2
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	368,935 in Automotive ( See Top 100 in Automotive ) 1,474 in Car Spark Plugs
Brand Name	Denso
Compatible with Vehicle Type	Car, Van
Core Material	Iridium
Country Of Origin	Japan
Customer Reviews	5.0 5.0 out of 5 stars (12)
EU Spare Part Availability Duration	1 Years
Global Trade Identification Number	00042511047099
Included Components	Iridium TT Spark Plug x1
Item Type Name	Spark Plug
Item Weight	0.12 Pounds
Manufacturer	Tetrosyl Express Limited
Manufacturer Part Number	IW20TT
Manufacturer Warranty Description	2 Year Manufacturer
Model Number	IW20TT
Number of Items	1
Number of Packs	1
OEM Equivalent Part Number	0001590003, 022218110, 0948200118, 0948200154, 101000000AB, 101000047AB, 1214007, 13066048, 1307867710, 1881108061, 02221811094, 0948200488, 101000001AB, 1214008, 1306605, 1881111060, 1UX118110, 210137000, 2240121B16, 22401VR306, 1UT118110, 2101037070, 2240118V16, 2240150V16, 25109002, 2W9486, 3009518861, 3490274, 4238208, 4249164, 4401549, 4401550, 5813800060, 596007, 60569086, 6553206604, 755444…
Thread Size	14 millimeters
Top Material Type	iridium
UPC	042511047099
Unit Count	1.0 count

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₨525

Duties & taxes included

In stock

Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Seychelles.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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