Home / 4 Pack NGK 3657 Laser Iridium Spark Plugs IZFR5K11
4 Pack NGK 3657 Laser Iridium Spark Plugs IZFR5K11
$78.77
Free shipping on all orders.
Qty In Stock: 20
The NGK 3657 Laser Iridium Spark Plug (IZFR5K11) is engineered for maximum durability and precision ignition in modern high-efficiency engines. Featuring a laser-welded iridium center electrode and platinum-tipped ground electrode, it offers superior longevity, consistent combustion, and optimal fuel efficiency—ideal for vehicles requiring extended service intervals.
Features & Benefits:
🔧 Iridium center electrode ensures high durability and spark strength
🔧 Platinum ground electrode extends wear life and performance
🔧 Designed for precise ignition and reduced emissions
🔧 Pre-gapped at 1.1mm for easy, OE-spec installation
Specifications:
Brand & Part Number: NGK 3657 (IZFR5K11)
Material: Iridium Center / Platinum Ground
Thread Size: 14mm
Reach: 19mm (0.75 in)
Hex Size: 5/8 in (16mm)
Heat Range: 5
Seat Type: Gasket
Resistor: Yes
Gap: 1.1mm (0.043 in)
Upgrade to NGK IZFR5K11 Laser Iridium for long-lasting ignition performance, maximum fuel efficiency, and OE-recommended quality—order now!
Shipping Info
Free shipping on every US order. In-stock parts typically ship within 1 business day from Texas.
Returns
30-day returns on unused parts in original packaging. Wrong or defective items are replaced or refunded. See the return policy.
How do I confirm this part fits?
Match the brand and part number to your vehicle, or use the Parts Finder on the homepage. Contact us before ordering if you are unsure.
Are these parts new?
Yes. TXN Supply Co sells new parts from trusted OEM-quality brands — not remanufactured cores.
How fast will my order ship?
In-stock orders ship within 1 business day. Delivery time depends on your ZIP; most US addresses arrive in 2–5 business days.
What is your return policy?
Unused items can be returned within 30 days in original packaging. Customer-initiated returns may include a restocking fee and return shipping.
