Spark plugs 300 and 260 M103, 200 and 230 M102 – Mercedes R107 R129 W124 W126 W201 NGK

Description

NGK Spark Plug – Premium Quality – Mercedes M102 M103 – R107 W123 W124 W126 W201 R129 W463

This NGK spark plug is a high-quality replacement for the original Mercedes spark plug A0031590503 and is known worldwide for its excellent quality, precise finish, and reliable ignition. NGK has been one of the leading spark plug manufacturers for decades and is used by both automotive manufacturers and motorsport specialists.

Thanks to high-quality materials and precise manufacturing, this spark plug ensures a powerful and stable spark, a reliable cold start, and smooth engine operation. The correct heat rating and electrode gap make this spark plug particularly suitable for the maintenance, overhaul, and restoration of classic Mercedes models with M102 and M103 engines.

alternative for the

Alternative to the 0031590503 / A0031590503 Bosch H8dc0 or H8dc+

Suitable for Mercedes models

• Mercedes C123 230 CE

• Mercedes W123 200
• Mercedes W123 230 E

• Mercedes W124 200
• Mercedes W124 200 E
• Mercedes W124 230 E
• Mercedes W124 260 E
• Mercedes W124 300 E

• Mercedes C124 300 CE

• Mercedes S124 260 TE
• Mercedes S124 300 TE
• Mercedes S124 E300 T 4Matic

• Mercedes W126 300 SE
• Mercedes W126 300 SEL

• Mercedes W201 190 E 2.0
• Mercedes W201 190 E 2.3
• Mercedes W201 190 E 2.5-16
• Mercedes W201 190 E 2.6

• Mercedes R107 300 SL

• Mercedes R129 300 SL

• Mercedes W463 300 GE

Suitable for Mercedes engines

• M102
• M103

OEM references

• A0031590503
• 0031590503

Specifications

1. Part: NGK spark plug.
2. Alternative to the 0031590503 / A0031590503 Bosch H8dc0 or H8dc+
3. Premium quality.
4. External thread: M14 × 1.25.
5. Thread length: 17.5 mm.
6. Wrench size: 16 mm.
7. High-quality nickel electrode.
8. Electrode gap: 0.7 mm.
9. Precise dimensions according to the original Mercedes specifications.
10. Reliable ignition, good cold and warm start characteristics, and smooth engine operation.
11. Suitable for the Mercedes models mentioned above.

Important

Always check the electrode gap before installation. This must 0.7 mm amounts.

We recommend replacing the spark plugs preventively every 30,000 kilometers to replace. Even when the engine is still running well, the ignition characteristics of the spark plug gradually decline. This can lead to rougher engine operation, higher fuel consumption, and a poorer cold start.

Always carefully inspect new spark plugs for damage from dropping them before installation. A dent or damage to the packaging may indicate a hairline crack in the ceramic. Damaged ceramic can come loose during use and cause serious engine damage.

Install the spark plugs exclusively in a cold engine and use the prescribed tightening torque according to Mercedes specifications.

Always check before purchase and installation whether the part is suitable and equivalent based on photos, description, and specifications; installed or used parts cannot be returned.