Will it hurt my Mercedes-Benz S420 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 does a puddle underneath my Mercedes-Benz S420 mean?

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 S420 engine than others?

Hard stops and starts can lead to premature wear on your engine’s components. Lighten up that lead foot and opt for steady, fluid starts and stops instead. Your engine (and your passengers!) will thank you.

Where can I have a Mercedes-Benz S420 tune-up done?

At your local Firestone Complete Auto Care! Our technicians know how to service, maintain, and repair Mercedes-Benz S420s.

How frequently do I need to get my Mercedes-Benz S420 fuel injectors cleaned?

The cleaning schedule for vehicle fuel injectors varies depending on your driving conditions and the type of fuel you use. Some manufacturers suggest cleaning your fuel system as part of routine maintenance, while others will recommend it on an as-needed basis if you’re experiencing poor performance. Reference your Mercedes-Benz owner’s manual for exact guidelines.

Who can I go to for Mercedes-Benz S420 tune-ups?

Your local Firestone Complete Auto Care is happy to help with your Mercedes-Benz S420 tune-up. Visit us online to see our latest offers and book an appointment.

1994 Mercedes-Benz S420 Engine Tune-Ups & Maintenance

Get a Tune-Up

Schedule Mercedes-Benz S420 Tune-Up

If your S420 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

Tune Into Your Mercedes-Benz S420

Is your engine overdue for a tune-up? If you're the type of driver who waits for something to go wrong with your vehicle, now is the time to work on that habit, particularly if you want to keep your 1994 Mercedes-Benz S420 in tip-top shape. Periodic tune-ups can bring more power back to your S420’s engine. Tune-ups help your engine start smoothly and run efficiently, which can lead to lower emission levels and better fuel economy. When you get routine engine tune-ups based on Mercedes-Benz's recommendations, you’re taking vital steps toward keeping your S420’s engine running smoother, longer.

Engine Tune-Up for Mercedes-Benz S420

Your nearest Firestone Complete Auto Care location has several options to choose from when it comes to Mercedes-Benz S420 engine tune-up services. The standard Firestone Tune-Up is one service option. The standard Firestone Tune-Up includes new spark plugs (and installation!), a thorough inspection of engine components, and a lifetime parts warranty*. Another service option pays special attention to the filters in your S420. Specifically, we replace the fuel filter and air filter. The third tune-up option is a fuel system cleaning service, which is a three-step process that removes varnish, dirt, and carbon deposits on your S420'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 S420: your vehicle’s maintenance record and mileage can determine which service is best. This means that a tune-up service that’s a great fit for another car may not be optimal for yours. Ask one of our technicians what your vehicle needs, based on your driving habits and your car’s current condition.

Where to Get a Tune-Up for Your Mercedes-Benz S420

Come to Firestone Complete Auto Care for your next 1994 S420 engine tune-up. Consult your vehicle’s recommended service schedule from Mercedes-Benz, or make a service appointment if you notice any of these symptoms from your engine: shaking while the engine is idling, poor fuel economy, an illuminated check engine light on your dashboard, or a knocking sound when the engine is running.

*Check with a teammate at Firestone Complete Auto Care for complete terms and conditions regarding warranties.

Common Engine Tune-Up Q&A For 1994 Mercedes-Benz S420s

Will it hurt my Mercedes-Benz S420 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 does a puddle underneath my Mercedes-Benz S420 mean? 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 S420 engine than others? Hard stops and starts can lead to premature wear on your engine’s components. Lighten up that lead foot and opt for steady, fluid starts and stops instead. Your engine (and your passengers!) will thank you.
Where can I have a Mercedes-Benz S420 tune-up done? At your local Firestone Complete Auto Care! Our technicians know how to service, maintain, and repair Mercedes-Benz S420s.
How frequently do I need to get my Mercedes-Benz S420 fuel injectors cleaned? The cleaning schedule for vehicle fuel injectors varies depending on your driving conditions and the type of fuel you use. Some manufacturers suggest cleaning your fuel system as part of routine maintenance, while others will recommend it on an as-needed basis if you’re experiencing poor performance. Reference your Mercedes-Benz owner’s manual for exact guidelines.
Who can I go to for Mercedes-Benz S420 tune-ups? Your local Firestone Complete Auto Care is happy to help with your Mercedes-Benz S420 tune-up. Visit us online to see our latest offers and book an appointment.

Maintenance for Your 1994 Mercedes-Benz S420

Take care of your vehicle and it'll take care of you. Click on a service below to learn more about properly maintaining your Mercedes-Benz S420.

Repair Service for Your 1994 Mercedes-Benz S420

Nothing lasts forever. Even your Mercedes-Benz S420's many parts and pieces. When something breaks, we're ready. Click on a repair below to learn more about 1994 Mercedes-Benz S420 repairs.