RBT252

I appear to be leaking ABC fluid, which needs to be topped up once a month.
The leak seems to come from a pipe next to the sump/oil pan. I checked to see if the nut was tight, and it was. I have attached images, you can see the connection is covered in oil.
When I clean the connection with a rag it doesn't immediately seep oil, it is possible that that's not the problem and that the oil is leaking from higher up in the engine bay and dripping down onto that connection.

Have you seen this before or have any recommendations on how to proceed?

I purchased the car at the beginning of the year and became aware of the leak when replacing the accumulators.
I also noticed that when I checked the ABC fluid level, the oil on the dipstick was covered in tiny bubbles. This could be because air is getting into the system where the leak is, or it may be nitrogen from a burst accumulator.

BlownV8

Get rid of the car. You will be chasing expensive ABC issues the entire time you own the car.

TimC300

To me it does look like that fitting is leaking. I dont have that system so not much help. What is in there, an o-ring? If so replace it then see where that gets you. When I have leaks in general always clean the area thoroughly then inspect for fresh fluid.

Mark out West

You sure that's an ABC line? None of the lines I could locate were attached to the engine. It might be one of the transmission oil cooler lines, like #8 in this diagram:


You might want to follow the line forward or back to see where it goes.

Here's a shot of pipe assembly from eBay:



I'm assuming you've got the W215 with the V-8.

RBT252

That looks like the correct line.
The mechanic said the line attached to the cooler was leaking. I asked if it was an ABC line, and he said yes.
Yes, it's a V8 C215 CL55 Kompressor AMG

Mark out West

Get a new mechanic.

As to the bubbles in the ABC reservoir, that's troubling. Maybe a leak on the suction/low pressure side of the circuit is allowing air to pass through the pump. I would check the supply line from the reservoir to the pump as a first step.

Also, your dipstick shows an awfully full reservoir, which might also be part of the problem. When the engine is stopped and the level is measured after 15 minutes, is it at the top divot on the stick?