Are these car known to lose intercooler coolant it seems I keep having to add fluid.

 

Which year is the car? If facelift then it could be a rock damage to auxillary heat exchanger, ones for engine coolant ones for IC coolant. If tuned could be a leaking intercooler, they are known to leak after certain boost levels. Or piping.

 

It’s a 2014 ml63 I will have to start looking harder I already did a general scan looking for leaks or wet spots. I’ll look harder now

 

Try taking the splash shields off to have a better look. No aux heat exchangers on ml63 seems like so thats out of the equation. Good luck.

 

Lay some pieces of large white posterboard on the garage floor and park over it

 

It may be boiling out of your cap, landing on the hot V and evaporating. Look for orange residue on the hot V or around the cap. if you do a hard run open the hood and look and see if the cap area is wet.

 

Also check the coolant reservoir in the center of the motor, take the engine cover off, make sure that is topped off as well.