Product Description Product DescriptionThese are authentic NGK Iridium IX high-performance spark plugs, stock number 2309, part model LFR7AIX, widely used as OEM direct replacement for gasoline passenger vehicles.Equipped with 0.6mm laser-welded ultra-fine iridium center electrode, it delivers outstanding ignition efficiency, quicker throttle response, stable idle speed, improved fuel economy and longer service life up to 60,000–80,000 miles.Tapered ground electrode optimizes flame spread, effectively avoiding misfire under high temperature and heavy load conditions. Built-in 5000Ω anti-interference resistor eliminates radio noise. Anti-corrosion plated shell prevents thread seizure and air leakage, plug-and-play installation without any modification.What You Get4 × NGK 2309 LFR7AIX Iridium IX Spark Plugs with original individual boxes + outer 4-pack boxKey Features
- 0.6mm ultra-thin iridium electrode, excellent for turbo and naturally aspirated engines
- Copper core inner electrode enhances heat dissipation, reduces carbon deposits and overheating risk
- OEM standard size, compatible with Japanese, European, American and Korean mainstream models
- Heat range 7, suitable for high-load driving and mild vehicle tuning
Full Technical Parameters
- Stock No.: 2309
- Model: LFR7AIX
- Series: Iridium IX
- Gap: 1.1mm
- Heat Range: 7
- Thread: M14×1.25
- Thread Length: 19mm
- Seat: Gasket type
- Hex Size: 16mm
- Resistor: 5000 Ohm
Recommended Torque
- Aluminum cylinder head: 10.8–14.5 ft-lbs
- Cast iron cylinder head: 10.8–18 ft-lbs
Fitment Notice
- Please confirm part number 2309 / LFR7AIX, vehicle year, make and engine before purchase.
- Fitment list is for reference only, double-check compatibility via VIN or owner manual.
- Contact us first for any defective or fitment issues before opening a case.
After-sales Service✅ Fast shipping from US warehouse✅ 24-hour message reply✅ Professional after-sales solution for qualified problems
- Shipping
- Returns
- Contact Us
Shipping：Ship from US Warehouse
Tracking uploaded within 2hrs; ship out within 24hrs (excl holidays/weekends), US delivery: 2-5 business days.
Returns：30-day valid after delivery
· Damaged/defective goods: free replacement or full refund, contact us first.
· Buyer’s personal reason return: buyer pays return shipping; up to 20% restock fee.
· RMA required before return; items must be unused with original packaging, unauthorized returns refused.
Service & response
Messages replied within 24 working hours. Contact us for any issues before dispute/negative response; positive response issued after completed order.
Shipping
Shipping：Ship from US Warehouse
Tracking uploaded within 2hrs; ship out within 24hrs (excl holidays/weekends), US delivery: 2-5 business days.
Returns
Returns：30-day valid after delivery
· Damaged/defective goods: free replacement or full refund, contact us first.
· Buyer’s personal reason return: buyer pays return shipping; up to 20% restock fee.
· RMA required before return; items must be unused with original packaging, unauthorized returns refused.
Contact Us
Service & response
Messages replied within 24 working hours. Contact us for any issues before dispute/negative response; positive response issued after completed order.
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