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What Happens If You Don’t Change Your Oil? | Oil Quality, Engine Effects

What Happens If You Don’t Change Your Oil?Service CenterSchedule an Oil Change

If there isn’t enough oil in your engine — or if it’s dirty — it won’t be able to absorb the heat from the pistons and other components of the engine block. What does this mean for Wilsonville drivers? You can run into serious issues that’ll have lasting effects on your car’s performance if you don’t replace your oil. Learn more about the importance of regular Synthetic Motor Oil Replacement* with the experts at the Mercedes-Benz of Portland service center.

What’s the Function of Motor Oil?

While oil’s main job is to act as a lubricant, it also performs other important functions that benefit your vehicle:


  • Oil prevents engine overheating by absorbing heat.
  • Your vehicle’s pistons can weld themselves to the cylinders without the correct amount of clean oil.
  • Fresh oil keeps your vehicle running smoothly on West Linn roads.
  • Dirt and debris can build up in the oil if you neglect Synthetic Motor Oil Replacement.

How Often is Oil Service Needed?

Synthetic Motor Oil Replacement is performed as a component of Mercedes-Benz Service A** and Service B**. Service A is performed after 1 year or 10,000 miles (whichever comes first), while Service B is performed after 2 years or 20,000 miles (whichever comes first). Both of these service intervals include Synthetic Motor Oil Replacement, as well as other much-needed services for your vehicle.

How Do I Complete Oil Service Myself?

First, you’ll want to check your owner’s manual to ensure you choose the correct oil for your Mercedes-Benz vehicle. Next follow these steps:


  1. Elevate your car with jack stands or steel ramps.
  2. Find the oil drain plug on the bottom of the oil pan under the engine. Place an oil basin under the plug, then unscrew the plug and allow the old oil to drain (can take up to 15 minutes). Once all the oil is drained, you can replace the plug.
  3. Locate and remove your oil filter with an oil filter wrench. Know that a bit of extra oil will drain out when you remove the filter, so you’ll want to make sure you keep the basin underneath to catch it.
  4. Grab your new filter and rub a bit of oil around the rubber seal. This essential step ensures your filter is watertight.
  5. Place the new filter, then tighten by hand.
  6. You can remove the oil cap now that your old oil is drained and a new filter is in place. Pour in the specified amount of new oil (look in your owner’s manual if you’re unsure of the exact amount). Lastly, replace the oil cap.
  7. Before you close up shop, you’ll need to check your oil level by pulling out the dipstick. If the level is still low, add another ounce and check it again. You’re good to go once you get a proper oil level reading!

Receive Expert Oil Service at Mercedes-Benz of Portland!

Now that we’ve answered the question, “What happens if I don’t change my oil?” you can reach out to Mercedes-Benz of Portland for help or questions. The professionals at Mercedes-Benz of Portland are happy to answer any questions you may have about Service A costs*** and Service B costs***. We complete every oil service using genuine Mercedes-Benz parts. Simply schedule your appointment online to get started!


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*Oil and filter change is the base advertised service component. Additional services as determined by your vehicle’s ASSYST Plus system, which calculates service needs based on your driving habits, time, mileage and environmental conditions, may increase service cost.

**Services and pricing for Service A/Service B may vary due to your driving habits, mileage, and local environmental conditions. Please refer to your maintenance booklet for additional details and general guidelines for your vehicle’s year and model.

***2009 and newer Mercedes-Benz vehicles only. Price advertised for Service A/Service B includes all factory-required components. Please refer to your maintenance booklet for the complete list of factory-required services and details on the specific intervals for your vehicle’s year and model.

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1605 SW Naito Parkway • Portland, OR 97201

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Today's Hours:

Open Today! Sales: 9am-7pm

Open Today! Service: 7am-6pm

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Mercedes-Benz of Portland

1605 SW Naito Parkway Portland, OR

Phone: 503-928-8470



Phone: 503-928-8470

1605 SW Naito Parkway Portland, OR


Phone: 503-928-8470

1605 SW Naito Parkway Portland, OR


Phone: 503-928-8470

1605 SW Naito Parkway Portland, OR
45.511462 -122.676529
Mercedes-Benz of Portland 45.511462, -122.676529.