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On average, the cost for a Mercedes-Benz 300D Glow Plugs Replacement is $112 with $17 for parts and $95 for labor. Prices may vary depending on your location.
| Car | Service | Estimate | Shop/Dealer Price |
|---|---|---|---|
| 1991 Mercedes-Benz 300DL5-2.5L Turbo Diesel | Service typeGlow Plugs Replacement | Estimate$275.50 | Shop/Dealer Price$320.76 - $373.84 |
| 1982 Mercedes-Benz 300DL5-3.0L Turbo Diesel | Service typeGlow Plugs Replacement | Estimate$132.03 | Shop/Dealer Price$158.82 - $199.75 |
| 1987 Mercedes-Benz 300DL6-3.0L Turbo Diesel | Service typeGlow Plugs Replacement | Estimate$265.02 | Shop/Dealer Price$316.35 - $375.69 |
| 1992 Mercedes-Benz 300DL5-2.5L Turbo Diesel | Service typeGlow Plugs Replacement | Estimate$233.50 | Shop/Dealer Price$278.74 - $331.80 |
| 1984 Mercedes-Benz 300DL5-3.0L Turbo Diesel | Service typeGlow Plugs Replacement | Estimate$132.03 | Shop/Dealer Price$158.85 - $199.80 |
| 1983 Mercedes-Benz 300DL5-3.0L Turbo Diesel | Service typeGlow Plugs Replacement | Estimate$132.03 | Shop/Dealer Price$158.82 - $199.75 |
| 1990 Mercedes-Benz 300DL5-2.5L Turbo Diesel | Service typeGlow Plugs Replacement | Estimate$244.00 | Shop/Dealer Price$288.82 - $341.57 |
| 1985 Mercedes-Benz 300DL5-3.0L Turbo Diesel | Service typeGlow Plugs Replacement | Estimate$137.03 | Shop/Dealer Price$164.24 - $205.47 |
Diesel fuel is self-igniting under pressure. However, very cold temperatures can prevent ignition. This is where glow plugs come into play. Unlike spark plugs, which create an arc of electricity, glow plugs preheat the cylinder so the fuel can ignite more easily. The electrode heats up, glowing like the filament in an incandescent light bulb, and provides the necessary assistance to ignite the diesel fuel.
The glow plugs will eventually fail and require replacement, though not at any specific interval. It may be necessary to replace the wiring harness, the glow plugs, and the relay that controls the glow plugs. In some vehicles, the relay actually fails more often than the glow plugs. If you suspect a problem with the glow plugs on your diesel engine, have one of our expert mechanics inspect and replace them as necessary.
Glow plug replacement isn’t like replacing spark plugs, and some diesel owners can go for 100,000 miles or more without changing them. The relays fail more often than the plug, which is another reason it is very important to have the problem diagnosed by one of our expert diesel mechanics. This will ensure that you’re fixing the underlying problem, rather than just addressing symptoms, saving you time, money and headaches.
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