Will it hurt my Mercedes-Benz 420SEL to drive with old spark plugs?

When it’s time to replace the spark plugs, don’t delay. These small (but vital!) parts provide the electric spark that your car needs in order to start, and old spark plugs can prevent your car from starting at all. Replace spark plugs on time or about every 30,000 miles or so.

What should I do if I see leaks under my 420SEL?

Puddles could indicate that your vehicle is leaking coolant, oil, or brake fluid. Ignoring these leaks can lead to permanent engine damage, so address these symptoms ASAP with a tune-up service.

Are some driving habits better for my Mercedes-Benz 420SEL engine than others?

You can make your driving habits more engine-friendly. Hard starts and stops can increase the stress on engine parts, especially over many years. Boost your fuel economy and care for your engine by using gradual, smooth starts and stops instead.

I need a Mercedes-Benz 420SEL tune-up. Where can I get on?

At your closest Firestone Complete Auto Care! Our experienced technicians offer Mercedes-Benz 420SEL service, maintenance, and repairs.

How frequently do I need to get my Mercedes-Benz 420SEL fuel injectors cleaned?

Factors like fuel type and driving conditions can affect how frequently you need to clean your 420SEL fuel injectors. Some manufacturers recommend a fuel system cleaning as part of routine maintenance, or as needed if your vehicle is showing signs of poor fuel system performance.

Who can I go to for Mercedes-Benz 420SEL tune-ups?

Visit your local Firestone Complete Auto Care for your Mercedes-Benz 420SEL tune-up. Make an appointment online and view our latest offers to save big.

Engine Tune-Up Service for Your 1986 Mercedes-Benz 420SEL

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Schedule an Appointment for Your Mercedes-Benz 420SEL Tune-Up

If your 420SEL is acting strange or making new noises, it could be engine tune-up time. Don’t wait until small problems get bigger. Make an appointment now.

Schedule an Appointment

Enhance Mercedes-Benz 420SEL Performance with a Tune-Up

Is it tune-up time? If you usually wait until your car has an issue to take it in for service, it might be time to change your ways, particularly if you want to keep your 1986 Mercedes-Benz 420SEL in tip-top shape. Routine engine tune-ups can bring power back to your 420SEL. Tune-ups help your engine start smoothly and run efficiently, which can mean better fuel economy (a win for you) and lower emissions (a win for the environment). When you take your car for regular engine tune-ups as recommended by Mercedes-Benz, you can rest assured you’re investing in your 420SEL’s long-term engine performance.

Mercedes-Benz 420SEL Engine Tune-Up Services

The Firestone Complete Auto Care location in your community offers several Mercedes-Benz 420SEL engine tune-up services. One option is the standard Firestone Tune-Up. This includes the installation of new spark plugs and a visual inspection of your engine’s components, plus a lifetime warranty on parts*. A second service option replaces the air and fuel filter in your 420SEL. Our third service is a thorough cleaning of the fuel system. During this type of tune-up, we use a three-step process to get rid of harmful varnish, dirt, and carbon deposit buildup in your 420SEL’s fuel injectors, throttle body, and throttle plate. This goes a long way in boosting your fuel system’s overall performance. Consider this when choosing a tune-up service for your 420SEL: your vehicle’s maintenance record and mileage can determine which service is best. If you’re not sure what services are the best fit for your car, let us help! Chat with a Firestone technician before you jump into a specific service to ensure your engine tune-up money is well-spent.

Where to Get a Mercedes-Benz 420SEL Tune-Up

Come to Firestone Complete Auto Care for your next 1986 420SEL engine tune-up. Follow Mercedes-Benz's recommended maintenance schedule or book an appointment as soon as you notice one of the following: decreased gas mileage, "rough" idling or stalling when stopped, engine knocking, or an illuminated check engine light.

*Ask a Firestone Complete Auto Care teammate about full terms and conditions for warranties.

Common Engine Tune-Up Q&A For 1986 Mercedes-Benz 420SELs

Will it hurt my Mercedes-Benz 420SEL to drive with old spark plugs? When it’s time to replace the spark plugs, don’t delay. These small (but vital!) parts provide the electric spark that your car needs in order to start, and old spark plugs can prevent your car from starting at all. Replace spark plugs on time or about every 30,000 miles or so.
What should I do if I see leaks under my 420SEL? Puddles could indicate that your vehicle is leaking coolant, oil, or brake fluid. Ignoring these leaks can lead to permanent engine damage, so address these symptoms ASAP with a tune-up service.
Are some driving habits better for my Mercedes-Benz 420SEL engine than others? You can make your driving habits more engine-friendly. Hard starts and stops can increase the stress on engine parts, especially over many years. Boost your fuel economy and care for your engine by using gradual, smooth starts and stops instead.
I need a Mercedes-Benz 420SEL tune-up. Where can I get on? At your closest Firestone Complete Auto Care! Our experienced technicians offer Mercedes-Benz 420SEL service, maintenance, and repairs.
How frequently do I need to get my Mercedes-Benz 420SEL fuel injectors cleaned? Factors like fuel type and driving conditions can affect how frequently you need to clean your 420SEL fuel injectors. Some manufacturers recommend a fuel system cleaning as part of routine maintenance, or as needed if your vehicle is showing signs of poor fuel system performance.
Who can I go to for Mercedes-Benz 420SEL tune-ups? Visit your local Firestone Complete Auto Care for your Mercedes-Benz 420SEL tune-up. Make an appointment online and view our latest offers to save big.

Maintenance for Your 1986 Mercedes-Benz 420SEL

Stay ahead of any potential issues with your Mercedes-Benz 420SEL so your car can keep pace with life! Learn more about proper maintenance for your vehicle below.

Repair Service for Your 1986 Mercedes-Benz 420SEL

Your car takes care of you, and we’ll take care of your car. When it’s time for a repair on your Mercedes-Benz 420SEL, we’re here to help. Check out more info below about 1986 Mercedes-Benz 420SEL repairs.