What happens if my BMW 840i 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 BMW’s recommendations.

What should I do if I see leaks under my 840i?

Don't ignore puddles of fluid under your BMW 840i. It could signal a coolant leak, brake fluid leak, or an oil leak. Let any one of these leaks linger and it could cause engine damage.

Are some driving habits better for my BMW 840i 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.

Where can I get a tune-up for my BMW 840i?

At your closest Firestone Complete Auto Care! Our experienced technicians offer BMW 840i service, maintenance, and repairs.

How frequently do the fuel injectors in my BMW 840i 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 can I go to for BMW 840i tune-ups?

When your 840i needs a tune-up, head to your local Firestone Complete Auto Care. Check out our latest offers to save on your service and schedule an appointment online.

2025 BMW 840i Engine Tune-Ups & Maintenance

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Schedule Your BMW 840i Tune-Up Service Appointment

Tune in to tune up. Listen to your 840i and schedule an engine tune-up at the first strange squeak, clunk, or click. Make an appointment today.

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Tune Into Your BMW 840i

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, it might be time to change your ways, particularly if you want to keep your 2025 BMW 840i in tip-top shape. Periodic tune-ups can bring more power back to your 840i’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 follow the guidelines specified by BMW for your vehicle’s tune-up schedule, you can rest assured you’re investing in your 840i’s long-term engine performance.

BMW 840i Engine Tune-Up Services

Your nearest Firestone Complete Auto Care location has several options to choose from when it comes to BMW 840i engine tune-up services. One option is the standard Firestone Tune-Up. It includes a complete visual inspection of engine components, installation of new spark plugs, and a lifetime warranty on parts*. A second service option replaces the air and fuel filter in your 840i. 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 840i’s fuel injectors, throttle body, and throttle plate. The result? Restored fuel system performance. Keep in mind that your 840i's mileage and maintenance history can uniquely impact its tune-up needs. A one-size-fits-all engine tune-up procedure doesn’t necessarily exist. 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 BMW 840i Tune-Up?

If you’re looking for 2025 840i engine tune-up services, head to Firestone Complete Auto Care. Follow BMW's recommended maintenance schedule or book an appointment as soon as you notice one of the following: shaking while the engine is idling, poor fuel economy, knocking noises in the engine, or a lit up check engine light on your dashboard.

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

2025 BMW 840i Engine Tune-Up Q&A

What happens if my BMW 840i 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 BMW’s recommendations.
What should I do if I see leaks under my 840i? Don't ignore puddles of fluid under your BMW 840i. It could signal a coolant leak, brake fluid leak, or an oil leak. Let any one of these leaks linger and it could cause engine damage.
Are some driving habits better for my BMW 840i 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.
Where can I get a tune-up for my BMW 840i? At your closest Firestone Complete Auto Care! Our experienced technicians offer BMW 840i service, maintenance, and repairs.
How frequently do the fuel injectors in my BMW 840i 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 can I go to for BMW 840i tune-ups? When your 840i needs a tune-up, head to your local Firestone Complete Auto Care. Check out our latest offers to save on your service and schedule an appointment online.

Maintenance for Your 2025 BMW 840i

We know it’s not just a car, it’s your car. We’ll help you properly maintain your BMW 840i to keep it on the road and running smoothly. Learn more about maintenance below.

Repair Service for Your 2025 BMW 840i

Nothing lasts forever. Even your BMW 840i's many parts and pieces. When something breaks, we're ready. Click on a repair below to learn more about 2025 BMW 840i repairs.