What happens if my Mercedes-Benz 420SEL spark plugs fail?

Replace spark plugs on time or about every 30,000 miles or so. Without the spark of electricity created by spark plugs, your engine doesn’t have the combustion it needs to start — which could leave you stranded on the road. Always replace your spark plugs on time based on Mercedes-Benz’s recommendations.

What do I do if I see a pool of liquid under my Mercedes-Benz 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.

What do hard starts and stops do to my 420SEL engine?

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 get a tune-up for my Mercedes-Benz 420SEL?

At your nearby Firestone Complete Auto Care! Whether you need Mercedes-Benz 420SEL service, maintenance, or repairs, our technicians can get the job done.

How often do Mercedes-Benz 420SEL fuel injectors need to be cleaned?

The frequency at which car fuel injectors should be cleaned can vary depending on several factors, including the type of fuel used and the driving conditions. Some manufacturers generally recommend a fuel system cleaning as part of your general car maintenance, or as needed based on symptoms of poor fuel system performance.

Who offers Mercedes-Benz 420SEL tune-ups?

Your local Firestone Complete Auto Care is happy to help with your Mercedes-Benz 420SEL tune-up. Visit us online to see our latest offers and book an appointment.

Engine Tune-Up Service for Your 1990 Mercedes-Benz 420SEL

Get a Tune-Up

Schedule Your Mercedes-Benz 420SEL Tune-Up Service Appointment

Tune in to tune up. Listen to your 420SEL and schedule an engine tune-up at the first strange squeak, clunk, or click. Make an appointment today.

Schedule an Appointment

Tune-Ups to Help Your Mercedes-Benz 420SEL Run Better

Is it time for an engine tune-up? If you usually wait until your car has an issue to take it in for service, it might be time to change your ways, especially if you want your 1990 Mercedes-Benz 420SEL’s engine to last for a long time. Periodic tune-ups can bring more power back to your 420SEL’s engine. 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.

Engine Tune-Up for Mercedes-Benz 420SEL

Your nearest Firestone Complete Auto Care location has several options to choose from when it comes to Mercedes-Benz 420SEL engine tune-up services. The first is the standard Firestone Tune-Up. The standard Firestone Tune-Up includes new spark plugs (and installation!), a thorough inspection of engine components, and a lifetime parts warranty*. The second service focuses on your 420SEL's filters, specifically replacing the air filter and fuel filter. 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. Here’s something to remember when choosing services: the mileage and service history of your 420SEL can determine what kind of service it needs. 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 Should I Go for My Mercedes-Benz 420SEL Tune-Up?

If you’re looking for 1990 420SEL engine tune-up services, head to Firestone Complete Auto Care. 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: stalling or shaky idling when you’re stopped, diminished fuel economy, knocking noises in the engine, or a lit up check engine light on your dashboard.

*Talk to a Firestone Complete Auto Care teammate for full terms and conditions on warranties.

1990 Mercedes-Benz 420SEL Engine Tune-Up Q&A

What happens if my Mercedes-Benz 420SEL spark plugs fail? Replace spark plugs on time or about every 30,000 miles or so. Without the spark of electricity created by spark plugs, your engine doesn’t have the combustion it needs to start — which could leave you stranded on the road. Always replace your spark plugs on time based on Mercedes-Benz’s recommendations.
What do I do if I see a pool of liquid under my Mercedes-Benz 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.
What do hard starts and stops do to my 420SEL engine? 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 get a tune-up for my Mercedes-Benz 420SEL? At your nearby Firestone Complete Auto Care! Whether you need Mercedes-Benz 420SEL service, maintenance, or repairs, our technicians can get the job done.
How often do Mercedes-Benz 420SEL fuel injectors need to be cleaned? The frequency at which car fuel injectors should be cleaned can vary depending on several factors, including the type of fuel used and the driving conditions. Some manufacturers generally recommend a fuel system cleaning as part of your general car maintenance, or as needed based on symptoms of poor fuel system performance.
Who offers Mercedes-Benz 420SEL tune-ups? Your local Firestone Complete Auto Care is happy to help with your Mercedes-Benz 420SEL tune-up. Visit us online to see our latest offers and book an appointment.

Proactive Maintenance - 1990 Mercedes-Benz 420SEL

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 420SEL.

Repairs on Your 1990 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 1990 Mercedes-Benz 420SEL repairs.