Spark plug NOS M100 M110 M115 M116 M117 M121 M123 – alternative to the Bosch W8DC0

Description

Original Mercedes NOS spark plug – highest quality – Mercedes M100 M110 M115 M116 M117 M123

This original Mercedes NOS (New Old Stock) spark plug is an unused original Mercedes part from old factory stock with OEM numbers A0031591103 / 0031591103, A0031594603 / 0031594603 and A0031592903 / 0031592903. The spark plug was produced according to the original Mercedes specifications and quality standards from the period when these engines were still in production.

Thanks to the original material selection, precise manufacturing, and optimal thermal rating, this Mercedes NOS spark plug offers reliable ignition, smooth engine operation, and optimal combustion. For enthusiasts who wish to maintain or restore their Mercedes as close to the original as possible, this original Mercedes NOS spark plug represents the highest quality available.

Suitable for Mercedes models

• Mercedes W100 600 Pullman

• Mercedes W115 /8 200, 220 and 230.4

• Mercedes W123 200, 230, 250 and 280
• Mercedes C123 230 C, 280 C and 280 CE
• Mercedes S123 230 T, 250 T and 280 TE

• Mercedes W116 280 S, 280 SE, 280 SEL, 350 SE, 350 SEL, 450 SE, 450 SEL and 450 SEL 6.9

• Mercedes W126 280 S, 280 SE, 280 SEL, 380 SE, 380 SEL, 420 SE, 420 SEL, 500 SE and 500 SEL

• Mercedes C126 380 SEC, 420 SEC, 500 SEC and 560 SEC

• Mercedes R107 280 SL, 350 SL, 380 SL, 450 SL, 500 SL and 560 SL

• Mercedes C107 280 SLC, 350 SLC, 380 SLC, 450 SLC and 450 SLC 5.0

Suitable for Mercedes engines

• M100
• M110
• M115
• M116
• M117
• M123

OEM references

Mercedes

• A0031591103
• 0031591103
• A0031592903
• 0031592903
• A0031594603
• 0031594603

Bosch

• W8DC0

Specifications

1. Part: original Mercedes NOS spark plug.
2. Original Mercedes part from old factory stock (New Old Stock).
3. OEM numbers: A0031591103 / 0031591103, A0031592903 / 0031592903 and A0031594603 / 0031594603.
4. Bosch reference: W8DC0.
5. Produced according to the original Mercedes specifications.
6. Highest available quality.
7. Suitable for M100, M110, M115, M116, M117, and M123 engines.
8. Ideal for maintenance, overhaul, and original restorations.
9. Suitable for the Mercedes models mentioned above.

Important

Always check new spark plugs for transport damage before installation. Dented packaging may indicate that the ceramic insulator part has sustained a hairline crack. Damaged ceramic can come loose during use and cause serious engine damage.

Always check the prescribed electrode gap before installation. Even original Mercedes NOS spark plugs may have a deviating electrode gap due to prolonged storage. If necessary, carefully adjust the gap according to Mercedes factory specifications.

We recommend replacing spark plugs preventively every 8 years or 30,000 kilometers, whichever comes first. Even in vehicles that are driven infrequently, the electrodes and insulation material can deteriorate due to aging, which can lead to a weaker spark, rough engine operation, higher fuel consumption, and reduced cold starting performance.

For optimal performance, we recommend always replacing spark plugs as a complete engine set. Simultaneously check the condition of the spark plug wires, distributor cap, and distributor rotor to prevent voltage loss and ignition malfunctions.

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.