Dinan D640-0003 is a single iridium performance spark plug for compatible B48 TU and B58 TU1 engine applications. It uses a 12 mm thread, 26.5 mm reach, 14 mm bi-hex, flat seat, and 0.5 mm supplied gap. Select it by exact engine, OE cross-reference, dimensions, heat range, and tuning requirements rather than an assumed vehicle list.
Key Features
Fitment
This plug is engine-specific, and Dinan identifies B48 TU and B58 TU1 applications rather than a complete verified year, make, and model table. No Convermax vehicle tags are added until authoritative YMM coverage is available. Confirm OE cross-reference 12125A523E0 and all plug dimensions before installation.
Specifications
| Brand | Dinan |
|---|---|
| Manufacturer Part Number | D640-0003 |
| Thread Diameter | 12 mm |
| Reach | 26.5 mm |
| Hex | 14 mm bi-hex |
| Seat | Flat |
| Supplied Gap | 0.5 mm |
| Quantity | One spark plug |
| UPC or GTIN | 810215392988 |
What's Included
One Dinan D640-0003 iridium spark plug. Order the correct quantity for the engine. Ignition coils, tools, and other service parts are not included.
About Dinan
Dinan manufactures automotive performance and replacement components. Match the exact manufacturer part number and published application details before installation.
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Frequently Asked Questions
Is D640-0003 sold as a complete engine set?
No. This listing is for one spark plug.
Which engines does Dinan identify?
Dinan identifies B48 TU and B58 TU1 applications, also described as Gen 2 B48 and Gen 3 B58.
Why are there no vehicle tags?
The authoritative source provides engine coverage but not a complete YMM table, so the listing is marked for fitment verification rather than using invented vehicle tags.
Installation Instructions
Installation should be completed by a qualified technician using the current manufacturer instructions. Verify the vehicle or system application, inspect every supplied component, follow the specified fastener and torque procedures, check clearances and routing, and confirm safe operation before driving.
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