Mercedes-Benz 380SL Spark Plug Replacement at your home or office.

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$115.83 - $148.07

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Spark Plug Replacement Estimate for Mercedes-Benz 380SL

Mercedes-Benz 380SL Spark Plug Replacement costs $126 on average.

CarServiceEstimateShop/Dealer Price
1981 Mercedes-Benz 380SLV8-3.8LService typeSpark Plug ReplacementEstimate$156.67Shop/Dealer Price$195.21 - $264.43
1982 Mercedes-Benz 380SLV8-3.8LService typeSpark Plug ReplacementEstimate$156.67Shop/Dealer Price$195.31 - $264.61
1985 Mercedes-Benz 380SLV8-3.8LService typeSpark Plug ReplacementEstimate$206.15Shop/Dealer Price$254.65 - $356.37
1983 Mercedes-Benz 380SLV8-3.8LService typeSpark Plug ReplacementEstimate$156.67Shop/Dealer Price$198.25 - $269.76
1984 Mercedes-Benz 380SLV8-3.8LService typeSpark Plug ReplacementEstimate$156.67Shop/Dealer Price$193.17 - $260.87
Show example Mercedes-Benz 380SL Spark Plug Replacement prices

Spark Plug Replacement Service

What are spark plugs and how do they work?

Spark plugs are one of the key components of your vehicle’s ignition system. They ignite gasoline and air inside of your engine. This gives your engine the power to propel you down the road. The spark plug takes high voltage electricity from the ignition coil and creates a spark at just right moment during the engine’s combustion cycle. This gives the engine the best mix of power, fuel economy and low emissions. However, the electrode at the end of the spark plug eventually wears out and can cause performance issues.

Spark plugs-MATROX-1

When should you replace spark plugs?

Replacement should follow the vehicle maintenance schedule. This will be listed in the vehicle’s owner’s manual. Some cars require regular replacement at 30k, 60k or 100k miles. It is possible in some cases that a spark plug might fail before the service schedule, but it’s not typically common.

Avoiding spark plug replacement can cause:

  • Difficulty starting your car.
  • Check engine light for a misfire code.
  • Flashing check engine light during acceleration for misfire, this can cause engine damage.
  • Reduced fuel economy and/or power.
  • Rough idle and/or unexplained engine vibration.
  • Failed State emission testing.

Even if only one spark plug is found to be faulty, they should always be replaced in sets. Most engines will require 4,6, or 8 spark plugs.

How do mechanics replace spark plugs?

Spark plugs are threaded into the engine’s cylinder head(s). Most cars have one plug per cylinder, so a four-cylinder engine will have four plugs, a six-cylinder engine will have six plugs, and so forth. The mechanic will:

  • Have the correct spark plugs on hand for your vehicle
  • Pull any diagnostic trouble codes that may be related to worn spark plugs.
  • Remove the original spark plugs and look at removed spark plugs for any clues indicating engine mis-operation exists; such as oil burning, excessively rich mixture, pre-ignition damage etc. Inform owner of any found unusual conditions.
  • Install new plugs using a torque wrench.
  • Finally, a road test of the vehicle to confirm normal operation.

Is it safe to drive with worn spark plugs?

Yes, but spark plugs that are worn enough to cause engine-misfiring have the potential to cause engine damage and overheating of the catalytic converter. Regardless of the age of the plugs, or mileage, if the engine misfires or runs poorly, the plugs should be inspected for defects. Generally, spark plug failure will not keep the engine from running, but in cases of extreme wear, you may experience a limitation in the speed at which you can drive the car. If the maintenance schedule says the plugs should be replaced, it is best to do so promptly.

When having spark plugs replaced keep in mind:

  • High-speed driving may accelerate spark plug wear. Consider earlier than required inspection and tune-up if you operate the car in severe conditions.
  • Plugs should always be promptly replaced per the manufacturer maintenance schedule even if they appear to be working perfectly.
  • If your vehicle is equipped with spark plug wires (as opposed to a coil-on-plug system), the wires should be replaced at the same time. This may increase the cost of your repair.
  • It is possible that when doing a spark plug replacement, your vehicle may also need additional parts like ignition coils, this will add to the repair cost.
  • Some engines require that the intake manifold be removed while replacing spark plugs. This may increase the parts and labor cost for the repair.
  • Leaking valve cover gaskets, which have let oil get in contact with the spark plugs, coils or wires, may be the cause of ignition system issues. Valve cover gaskets will need to be replaced in addition to the spark plugs, wires or coils. This will add to the repair cost.

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Meet some of our expert Mercedes-Benz mechanics

Real customer reviews from Mercedes-Benz owners like you.

Excellent Rating

(26)

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Theodore

15 years of experience
1299 reviews
Theodore
15 years of experience
Mercedes-Benz 380SL - Ignition Switch - Bellevue, Washington
Theo was ontime and extremely courteous. He diagnosed my vintage Mercedes' problem and returned a week later. The replacement part they sent him was incorrect, so he reassembled my dashboard and waited for the correct replacement. When it arrived, he not only installed it, but followed me to a service station and then test drove the vehicle to check for other problems. I will ABSOLUTELY use Your Mechanic.com in the future to avail myself of a great mobile service. Thank you.

Peter

42 years of experience
1320 reviews
Peter
42 years of experience
Mercedes-Benz 380SL - Pre-purchase Car Inspection - Anthem, Arizona
Outstanding knowledge and very professional.

Manuel

31 years of experience
395 reviews
Manuel
31 years of experience
Mercedes-Benz 380SL - Check Electrical Equipment - Orange, California
Manuel is very professional, knowledgeable and very honest. My 84 380SL Mercedes will not start and he determined that based on his diagnosis that I am going to need to have the fuel distributor repaired/rebuilt or get a refurbished one since the new ones are no longer available for this model. He was able to demonstrate the validity of his diagnosis and made it run for a couple of minutes by spraying starter fluid in the throttle because the latter is not getting fuel from the distributor. He made some valuable suggestions free-of-charge, to improve the performance of the engine. He came ahead of scheduled appointment and worked right away performing various diagnostics on the ignition and fuel system. Highly recommended.

Jonathan

12 years of experience
171 reviews
Jonathan
12 years of experience
Mercedes-Benz 380SL - Oil Change - Wellesley Hills, Massachusetts
Jon is a good good mechanic and very friendly. First time using the app and I liked, I already booked another service.

Excellent Rating

(26)

Rating Summary
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Number of Mercedes-Benz 380SL services completed
286+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercedes-Benz MECHANICS
900+
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