Hey there, Mercedes GLS 450 owners! Today, we're diving into a super practical topic: how to reset the oil service light on your 2020 GLS 450. It's one of those things that might seem intimidating at first, but trust me, it’s totally doable, and you can save yourself a trip to the dealership. Let's get started!

Why Reset the Oil Service Light?

First off, why is resetting the oil service light so important? Well, your Mercedes is a smart machine, and it uses that service light to tell you when it's time for an oil change. But sometimes, even after you've given your engine that fresh, golden goodness, the light stays on. This can be because the system needs a manual reset to acknowledge the service. Ignoring it isn't a great idea because that light also ties into your maintenance schedule and other important reminders. Keeping everything accurate ensures your GLS 450 stays in top-notch condition.

Step-by-Step Guide to Resetting Your Oil Service Light

Okay, let's get down to the nitty-gritty. Here’s a step-by-step guide to resetting the oil service light on your 2020 Mercedes GLS 450. Follow these instructions carefully, and you'll be all set!

Step 1: Get Ready in the Driver's Seat

First things first, hop into the driver's seat. Close the door – this might seem trivial, but it can affect the process. Make sure the key is in the ignition, and turn it to position one (one click). You should see the dashboard lights come on, but don't start the engine just yet.

Step 2: Navigate to the Service Menu

Now, use the steering wheel controls to navigate through the menus on your instrument cluster display. You're looking for the "Service" menu. Usually, you'll use the left-hand side buttons – the ones with the little house or back arrow – to scroll through the main options. Then, use the up and down arrows to find "Service." Once you highlight it, press the OK or Enter button (usually located on the right-hand side of the steering wheel).

Step 3: Find the "Assyst Plus" Option

Once you're in the "Service" menu, you'll see several options. Scroll down until you find "Assyst Plus." This is Mercedes-speak for the system that manages your service intervals. Highlight "Assyst Plus" and press OK again.

Step 4: Confirm the Service

Now, you should see an option like "Full Service" or "Confirm Service." Select this option. The system might ask you to confirm the oil grade used during the service. Make sure to select the correct grade to ensure accurate service intervals in the future. If you're not sure, check your service records or consult your Mercedes-Benz owner's manual.

Step 5: Reset the Service Interval

After confirming the service, you'll usually find an option to "Reset Service Interval" or something similar. Select this option and confirm your choice. The system will then reset the oil service light, and you should see a confirmation message on the display.

Step 6: Double-Check and You're Done!

Turn off the ignition and then turn it back on to make sure the oil service light has indeed been reset. If everything went smoothly, the light should be gone! Congrats, you just saved yourself some time and possibly some money by doing it yourself.

Common Issues and Troubleshooting

Okay, so what happens if things don’t go exactly as planned? Here are a few common issues you might encounter and how to troubleshoot them:

• Can’t Find the Service Menu: Make sure the key is in the correct position (usually position one) and that you're using the correct steering wheel controls. Sometimes it takes a few tries to get the hang of the menu navigation.
• "Assyst Plus" Not Showing Up: This could be due to a software glitch or an issue with the instrument cluster. Try turning the ignition off and on again, and repeat the steps. If it still doesn't appear, it might be time to visit a professional.
• Reset Fails: Ensure you've confirmed all the necessary information, like the oil grade. Also, double-check that you're following the steps in the correct order. A missed step can prevent the reset from completing.

Maintaining Your 2020 Mercedes GLS 450: Beyond the Oil Reset

Resetting the oil service light is just one small part of keeping your GLS 450 in tip-top shape. Here’s what else you should keep in mind:

Regular Oil Changes

Sticking to a regular oil change schedule is crucial. Mercedes-Benz recommends specific intervals, usually around 10,000 miles or once a year, but always refer to your owner's manual for the exact recommendations for your model year and driving conditions. Using the correct type of oil is also essential. Your GLS 450 likely requires synthetic oil that meets Mercedes-Benz specifications.

Check Other Fluids

Don't just focus on the engine oil! Regularly check and top off other fluids like coolant, brake fluid, power steering fluid, and windshield washer fluid. These fluids play critical roles in the overall performance and longevity of your vehicle.

Tire Maintenance

Proper tire maintenance is also vital. Check your tire pressure regularly and ensure your tires are properly inflated. Rotate your tires as recommended to ensure even wear. And don't forget to inspect your tires for any signs of damage or excessive wear.

Brake Inspections

Your brakes are one of the most important safety features of your vehicle, so make sure to have them inspected regularly. Listen for any unusual noises, like squealing or grinding, and pay attention to how your brakes feel when you press the pedal. If you notice anything unusual, get your brakes checked out by a professional ASAP.

Scheduled Maintenance

Follow the scheduled maintenance plan outlined in your owner's manual. This includes things like replacing filters, checking belts and hoses, and inspecting various systems. Sticking to the schedule can help prevent major problems down the road.

Why DIY Oil Reset?

So, why bother doing the oil reset yourself? Well, for starters, it can save you time and money. Dealerships often charge a premium for simple services like resetting the oil light. Plus, knowing how to do it yourself gives you a sense of independence and control over your vehicle's maintenance.

When to Seek Professional Help

Of course, there are times when it's best to leave things to the professionals. If you're not comfortable performing the oil change yourself, or if you encounter any major issues during the process, don't hesitate to take your GLS 450 to a qualified mechanic. Also, if the oil service light comes back on shortly after you've reset it, there could be an underlying problem that needs to be addressed.

Conclusion

There you have it, folks! Resetting the oil service light on your 2020 Mercedes GLS 450 is a straightforward process that you can easily do yourself. By following these steps and keeping up with regular maintenance, you can keep your GLS 450 running smoothly for years to come. Happy driving!