Spark plug NGK Platinum – Mercedes R129 M112 M113 M120

Description

NGK spark plug with platinum center electrode – Mercedes M112 M113 M119 M120

This NGK spark plug with a platinum center electrode is a high-quality replacement for the original Mercedes spark plug with OEM number A0031599403 / 0031599403. The quality, fit, and technical characteristics are comparable to those of the original part.

The platinum center electrode is more resistant to wear than a conventional nickel electrode. As a result, the electrode gap remains constant for longer, and the spark plug maintains a reliable and stable spark for an extended period. This contributes to a good cold start, smooth engine operation, and efficient combustion.

Suitable for Mercedes models

• Mercedes R129 SL 280, SL 320 and SL 500
• Mercedes R230 SL 350 and SL 500
• Mercedes R170 SLK 320

• Mercedes W140 S 420
• Mercedes C140 420 SEC / CL 420 and 600 SEC / CL 600

• Mercedes W220 S 280, S 320, S 350, S 430, S 500 and S 55 AMG
• Mercedes C215 CL 500 and CL 55 AMG

• Mercedes W202 C 240, C 280 and C 43 AMG
• Mercedes W203 C 240, C 240 4MATIC, C 320 and C 320 4MATIC

• Mercedes W210 E 240, E 280, E 320, E 430 and E 55 AMG
• Mercedes S210 E 240 T, E 280 T, E 320 T, E 430 T and E 55 T AMG

• Mercedes W211 E 240, E 320 and E 500
• Mercedes S211 E 240 T, E 320 T and E 500 T
• Includes various 4MATIC versions

• Mercedes C208 CLK 320, CLK 430 and CLK 55 AMG
• Mercedes A208 CLK 320, CLK 430 and CLK 55 AMG
• Mercedes C209 CLK 240, CLK 320 and CLK 500
• Mercedes A209 CLK 240, CLK 320 and CLK 500

• Mercedes W163 ML 320, ML 350, ML 430, ML 500 and ML 55 AMG
• Mercedes W164 ML 500

• Mercedes W251 R 500 4MATIC

• Mercedes W463 G 320, G 500 and G 55 AMG

• Mercedes C219 CLS 500

Suitable for Mercedes engines

• M112.910
• M112.911
• M112.912
• M112.913
• M112.914
• M112.916
• M112.917
• M112.920
• M112.921
• M112.922
• M112.923
• M112.940
• M112.941
• M112.942
• M112.943
• M112.944
• M112.945
• M112.946
• M112.947
• M112,949
• M112.953
• M112.954
• M112.955
• M112.970
• M112.972
• M112.973
• M112.975

• M113940
• M113941
• M113942
• M113943
• M113944
• M113948
• M113960
• M113961
• M113962
• M113963
• M113964
• M113965
• M113966
• M113967
• M113968
• M113969
• M113971
• M113980
• M113981
• M113982
• M113984
• M113986

• M119971
• M119981

• M120.980
• M120.982

OEM references

• A0031599403
• 0031599403

Specifications

1. Part: spark plug.
2. Brand: NGK.
3. Center electrode: platinum.
4. Number of ground electrodes: 1.
5. Interference suppression resistor: 1 kΩ.
6. Seal: flat sealing ring.
7. Connection: fixed SAE connection.
8. Wrench size: 16 mm.
9. Thread size: M14 × 1.25.
10. Thread length: 19 mm.
11. High quality, comparable to the original OEM version.
12. Suitable for various Mercedes M112, M113, M119, and M120 engines.

Benefits of a platinum spark plug

1. Longer lifespan than a conventional nickel spark plug.
2. The electrode gap remains stable for longer.
3. Reliable and powerful spark generation.
4. Good cold start characteristics.
5. Quiet and smooth engine operation.
6. Efficient combustion of the air-fuel mixture.
7. Replacement needed less often.

Important

Always carefully inspect new spark plugs for transport or fall damage before installation. A dent or damage to the packaging may indicate that the spark plug has been hit hard. As a result, the ceramic insulation part may contain invisible hairline cracks.

Damaged ceramic can come loose during use and enter the combustion chamber, potentially resulting in serious engine damage. Therefore, install only spark plugs with completely undamaged ceramic.

Always check the prescribed electrode gap before installation. Although new spark plugs are usually supplied ready for installation, the gap may deviate due to transport or improper handling. Adjust a platinum electrode with extreme care only to prevent damage.

We recommend replacing spark plugs preventively every 8 years or according to the mileage interval prescribed by Mercedes, whichever comes first. Due to the platinum center electrode, these spark plugs generally have a longer lifespan than conventional spark plugs.

For optimal performance, all engine spark plugs are replaced simultaneously. Please note that various M112 and M113 engines are equipped with two spark plugs per cylinder.

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.