Skip the auto shop - Our mechanics make house calls

Q: Convertible top fluid brand

asked by on

My convertible top started acting up today. It wouldn't open or close on its own. But I finally was able to close it top up after a couple of times. I was looking at my fluid level in the cylinder near the pump and it’s a little bit low, just below the Min level with the top up and closed. Is that normal? I don't see any leaks. Do I need to replace the entire thing or can I just add to it up to the Min or Max level? What brand of Hydraulic System Fluid do I use for a 2009 CLK350? Do I unscrew the one bolt and washer then put it back by hand? Is WD40 bad for my top joints? My car has 64,500 miles on it. Thanks.

Hello there. When checking the fluid, the top must be in the service position for an accurate reading. This should show the fluid level at the proper level once the top is in the service position.

The bolt and washer are removed carefully and the Mercedes special tool is used to add or remove fluid. The only approved convertible top fluid is the fluid supplied by Mercedes under their own brand.

WD40 is not a lubricate that is used to remove water and rust, but it is not sufficient for lubrication purposes long term. If the top is continuing to not work, then there is likely another fault other than the fluid level. The most common would be one of the top motors being faulty, a bad top position sensor, or a broken top switch. If you need help having these checked, a certified technician from YourMechanic can come to your car’s location to diagnose and repair your convertible top.

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
  1. Home
  2. Questions
  3. Convertible top fluid brand

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: My clutch pedal is extremely "light" and gears won't go in.

There are a few possibilities; you either have a problem with the hydraulics, a mechanical problem with the clutch, or a transmission fluid leak. Hydraulics: When you push down the clutch pedal, the clutch master cylinder (CMC) uses...

Q: Air Conditioning Compressor and Condenser Replacement

No air conditioning repairs are required for the normal operation of your vehicle and they do not affect the safety of your vehicle. If your AC is still working at this time, I would recommend holding off on any repairs...

Q: Hard throttle bucking

If the split seal on the air intake is after the MAF (Mass Airflow Sensor), it will cause this problem. When you give the motor a lot of throttle, a much larger amount begins to flow into the motor. This...

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.