Skip the auto shop - Our mechanics make house calls

Q: Wrong antifreeze and fuel additive used and the car is noisy and runs roughly

asked by on

I need your advice on a serious issue with my friend's car. She said that her check engine light went on and the car ran roughly. There was a lot of noise of the engine too. When I checked the oil, it had a green color. My friend put in diesel engine antifreeze. She put a gallon of it. What's more, she thought that the car would run better if she put fuel additive. She put in a bottle of diesel engine fuel additive. What should she do with her car and how serious is to put antifreeze and additive for a diesel engine into Mercedes? Thank you in advance.

A: This vehicle should not be run any at all u...

This vehicle should not be run any at all until it can be diagnosed and repaired.

In cases where coolant has been put into the engine, this can damage various engine components such as the bearings, pistons and crankshaft. The result may be serious engine damage, similar to what would happen if the head gasket were to fail. A qualified technician, such as one at YourMechanic, will be able to perform any service needs you may have. A good place to start would be a diagnostic inspection of the Check Engine Light.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Shifting issues from drive to reverse and back to drive

Mercedes has a dealer service order (#Order No: S-B-27.19/118A ) that addresses diagnosis, and possible dealer repair of the transmission for your model. Check with your dealer to confirm coverage of this.

Q: Chirping noise while idling around the pulleys.

The rubber drive belt may stretch a little over time and cause some noises when the tension becomes too loose. Worn bearings in the pulleys or drive system components may also make noise when they have become worn. Consider hiring...

Q: Engine stalls and serving tick over 2.5 diesel

Hi there. If the crank sensor is used only for misfire detection and NOT spark timing, the vehicle should start and run with the engine light on. Usually the crank sensor or the reluctor ring may have been damaged and...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.