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NGK 5545 Spark Plug
| Brand | NGK 5545 |
|---|---|
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Iridium |
| Electrical Terminal Type | Removable Nut |
| Ground Configuration | Standard |
| Ground Electrode Core Material | Nickel |
| Ground Electrode Quantity | 1 |
| Ground Electrode Tip Design | Taper Cut |
| Hex Size | 18 |
| Insulator Height | 50.00 |
| Manufacturer Heat Range | 9 |
| Part Number | DPR9EIX-9 |
| Pre-Gap Size | .036 |
| Reach | .75 |
| Resistance | 5000 |
| Seat Type | Flat |
| Stock Number | 5545 |
| Thread Diameter | 12.00 |
| Product line | Iridium IX Spark Plug |
| Fits | Ducati, Honda, Kawasaki, Triumph, Suzuki, Yamaha, and Lamborghini · 11 vehicles |
Iridium tip. Promotes strong spark performance and long service life.
Copper core. Helps transfer heat efficiently for consistent operation.
OE supplier heritage. Backed by NGK’s long-standing original equipment experience.
Cross-references AMS Automotive 4112, DENSO Auto Parts 5377 and Monroe Shocks & Struts 5545 for the same application. See all 15.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
NGK Iridium IX Spark Plug for Select Lamborghini Models
The NGK Iridium IX Spark Plug, part number 5545, is built for precise ignition performance in select Lamborghini applications. It combines an iridium center electrode with a copper core and a nickel ground electrode to support consistent spark delivery and stable combustion.
Key Features
- Iridium center electrode tip material for focused spark performance
- Copper center electrode core for efficient heat transfer
- Nickel ground electrode core material with standard ground configuration
- Taper cut ground electrode tip design
- Pre-gapped to .036 inch
- 5000 ohm resistance
- Flat seat design with 12 mm thread diameter and 0.75 inch reach
- 18 mm hex size and removable nut terminal type
Product Details
NGK’s Iridium IX line is engineered for drivers who want a spark plug built around durable electrode materials and OE-style fitment. Part number 5545, also identified as DPR9EIX-9, is specified for the 1985-1989 Lamborghini Countach, 1986-1990 Lamborghini LM002, and 1991 Lamborghini Diablo. This spark plug uses a 9 heat range and a .036 inch pre-gap, making it a direct-match option for the listed applications. This part cross-references DENSO Auto Parts (e.g., 5377) for the same application.
What It Helps Address
- Hard starting caused by worn or inconsistent spark plugs
- Misfire conditions related to degraded electrode wear
- Rough idle from weak ignition output
- Loss of throttle response from inefficient combustion
- Maintenance replacement for select Lamborghini Countach, LM002, and Diablo ignition service
Installation Notes and Tips
Verify the engine specification and existing plug gap before installation. The listed pre-gap is .036 inch, and the flat seat, 12 mm thread diameter, 0.75 inch reach, and 18 mm hex size should be matched to the cylinder head requirements. Use the correct torque procedure for the application and inspect ignition components during service. Fits 1985-1989 Lamborghini Countach, N/A. Fits 1986-1990 Lamborghini LM002, N/A. Fits 1991 Lamborghini Diablo, N/A.
Quality Assurance
NGK is a long-established OE spark plug supplier with broad coverage across automotive applications. Part number 5545 is manufactured to support original-equipment standards for durability and operational performance in the listed vehicles.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1991 | Lamborghini | Diablo | 5.7L | V12 | N/A | Gap 0.036"; OE Equivalent Design; Iridium IX Spark Plug |
| 1990 | Lamborghini | LM002 | 5.2L | V12 | N/A | Gap 0.036"; OE Equivalent Design; Iridium IX Spark Plug |
| 1989 | Lamborghini | Countach | 5.2L | V12 | N/A | Gap 0.036"; OE Equivalent Design; Iridium IX Spark Plug |
| 1989 | Lamborghini | LM002 | 5.2L | V12 | N/A | Gap 0.036"; OE Equivalent Design; Iridium IX Spark Plug |
| 1988 | Lamborghini | Countach | 5.2L | V12 | N/A | Gap 0.036"; OE Equivalent Design; Iridium IX Spark Plug |
| 1988 | Lamborghini | LM002 | 5.2L | V12 | N/A | Gap 0.036"; OE Equivalent Design; Iridium IX Spark Plug |
| 1987 | Lamborghini | Countach | 5.2L | V12 | N/A | Gap 0.036"; OE Equivalent Design; Iridium IX Spark Plug |
| 1987 | Lamborghini | LM002 | 5.2L | V12 | N/A | Gap 0.036"; OE Equivalent Design; Iridium IX Spark Plug |
| 1986 | Lamborghini | Countach | 5.2L | V12 | N/A | Gap 0.036"; OE Equivalent Design; Iridium IX Spark Plug |
| 1986 | Lamborghini | LM002 | 5.2L | V12 | N/A | Gap 0.036"; OE Equivalent Design; Iridium IX Spark Plug |
| 1985 | Lamborghini | Countach | 5.2L | V12 | N/A | Gap 0.036"; OE Equivalent Design; Iridium IX Spark Plug |
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