Skip the auto shop - Our mechanics make house calls

Q: Oil in the coolant tank, what are the possible causes please. What logical method of fault finding can I use to source the leak.

asked by on

My 2005 CLK-350 has Oil in the coolant tank, what are the possible causes please. What logical method of fault finding can I use to source the leak.

A: The transmission oil cooler is inside of th...

The transmission oil cooler is inside of the radiator and it may be leaking internally. If this is the case, you would need to replace the radiator and flush out the cooling system. If you’d like to get this fixed, have the leak pinpointed by a certified technician, such as one from YourMechanic, that way an accurate repair can be made.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Left turn signal staying on

It sounds like the multifunction switch in the steering wheel is bad and needs to be replaced. It is a common problem with these cars. I would suggest having a technician from YourMechanic come out and replace the multifunctioning turn...

Q: 2005 Nissan Altima SE 3.5L, motor mount replacement

Any broken motor mounts should be replaced immediately. If "all" are broken, then all should be replaced immediately. The problem with operating a vehicle with damaged mounts is the engine gets out of position and that can cause collateral damage...

Q: Coolant level dropping rapidly

If the coolant level keeps dropping there is either an internal or external leak. Leaks are typically found by simple pressure testing of the cooling system. Engine coolant can leak externally through a hose, radiator, water pump, etc. or internally...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...