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Oil changes are an essential part of car ownership. The oil’s job is to keep everything inside the engine lubricated and happy. As the oil is used, its lubricating properties fade, leading to increased wear on the engine components. The new synthetic oils that companies like Mercedes use can last up to 7,500 miles, nearly triple that of conventional oil.

Changing your oil can be an important step in learning how to service your Mercedes C250. Oil changes are some of the most basic jobs you can do at home and can make you more conscious of the importance of looking after your car. 


Mercedes models and years applicable:

  • 2012-2015 Mercedes-Benz C250


Symptoms and effects of unchanged oil:

  • Increased engine wear
  • Decreased fuel mileage
  • Decreased engine performance

In an engine, the oil’s job is to lubricate all of the moving parts. Without the lubrication, parts would wear rapidly, sending debris through the engine before it locks up.

Over time, the oil itself will degrade. The molecules inside of the oil break down, causing the oil to lose its viscosity. Modern synthetic oils last significantly longer than conventional oil, but still require scheduled changes. Always check with your vehicle’s manufacturer or its manual to find out how often your oil should be replaced. 


What will it cost to complete a Mercedes C250 oil change?

Our Mercedes oil change kit comes with everything you’ll need for around $80. The kit includes 6 liters of LIQUI MOLY oil, a new crush washer, and the oil filter housing cap seals.  

It’ll cost around double that to have an oil change performed by an independent shop or dealership. On top of the extra charge, you’ll have to wait until they can get to your car.


How long will it take to complete a Mercedes C250 oil change?

The oil change process is not long.  With the kit we provide and the proper tools at your disposal, the job shouldn’t take longer than thirty minutes. 


Tools required to complete a Mercedes C250 (M271) oil change:


Parts required to complete a Mercedes C250 (M271) oil change:


Steps required to complete a Mercedes C250 (M271) oil change:

Step 1: Change the oil filter

The oil filter housing sits behind the intake airbox, against the firewall. Use the 27mm socket to remove the cap and filter.

DIY Mercedes M271 Oil Change Loosening the oil filter housing cap

DIY Mercedes M271 Oil Change pulling out the oil filter

Pull the old filter off of the cap and clean the cap with some parts cleaner. Then, remove the three o-rings from the cap. A pick tool will make the removal quick and easy. 

DIY Mercedes M271 Oil Change o-ring locations

Dab the new o-rings with some fresh oil and install them onto the oil filter cap. Slide the new filter onto the cap and then reinstall it into the car. 

DIY Mercedes M271 Oil Change installing the new filter onto the cap

Initially, thread the cap into the housing by hand to prevent any cross-threading. Then, use the 27mm socket to torque the cap to 24Nm.


Step 2: Drain the oil

Before leaving the engine bay, crack open the oil fill cap. Then, jack the car up and place it onto jack stands. Covering the bottom of the engine is a plastic splash shield held on with seven fasteners. Use an 8mm socket to remove the fasteners.

DIY Mercedes M271 Oil Change removing the splash shield fasteners

Don’t look up as you remove the splash shield; there will be dirt and debris trapped above it. Place a drain pan under the drain plug. Position it farther toward the driver’s side as the oil will shoot out in that direction. Use a 13mm socket to remove the plug. 

DIY Mercedes M271 Oil Change removing the drain plug

Clean off the drain plug and place the new copper crush washer onto it. Then, thread in the drain plug by hand to prevent cross-threading and then use the 13mm socket to torque the plug to 30Nm.

Reinstall the splash shield using the 8mm socket and then lower the car back onto the ground. 

DIY Mercedes M271 Oil Change refitting the splash shield


Step 3: Refill the car with oil

Head into the engine bay and remove the oil filler cap. Then, pour in 5.5 liters of oil. The oil needs to make its way through the engine and down into the oil pan before you can check the level. 

DIY Mercedes M271 Oil Change filling the engine with 5.5 liters of oil

Wait around ten minutes and then check the level. If the oil doesn’t come up to the “full” line on the dipstick, add more in small increments until it does. Use a rag to clean any oil you may have spilled.


Step 4: Reset the service indicator

Sit in the driver’s seat and put the key into position one. Then, hold down the two center buttons on the steering wheel. 

DIY Mercedes M271 Oil Change steering wheel button locations

Select “Assist Plus” from the menu that appears on the center instrument cluster screen. Confirm that you’ve completed a full service and then hit “OK” twice. The service interval is now reset. 


Mercedes C250 (M271) Oil Change Torque Specs:

  • Mercedes Oil Filter Housing Cap = 22Nm or 16.2 ft-lbs, of torque
  • Mercedes Oil Pan Drain Plug = 30Nm or 22 ft-lbs, of torque

Just like that, your Mercedes is full of fresh oil and is equipped with a clean filter. If you’re interested in more DIYs for your Mercedes, you can visit mercedes.fcpeuro.com and subscribe to our YouTube channel.

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Written by :
Christian Schaefer

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