Hey Scotty,
I hope all is well.
I have an 09 Mercedes W204 C300 AWD that I received as a gift from a relative. It might need some coolant as the light did come on once but went away and hasn't returned since. It already had green coolant in it from when I received it (I think its that "all makes and models" coolant but I'm no sure), but I was told that Mercedes coolant is usually blue. In addition, I'm noticing what looks like some "dirt" in the coolant tank, but I think that might have come from the coolant cap (I'm hoping this is not signifying potential engine deterioration). I don't know how long the green coolant has been in the car but the car seems to have been running relatively fine on the green coolant, and I've driven it on a few long trips. I haven't found a green European car coolant yet (if such a thing even exists). What's your theory on this?
Thanks
I’d call the Dealership to make sure, I do believe it takes HOAT coolant, must be premixed.....
Double check what you need(the owner's manual should say) and it sounds like changing out the coolant wouldn't be a bad idea if you need and its easy to do. When you drain out the old if it has more dirty stuff in it than just that bit from the lid you might want to flush the coolant just to get any of that dirt out. If you plan on doing it yourself here's a little guide: https://www.youtube.com/watch?v=g8YZF5cW7-A
@jacksonishere
Thanks for the reply and the video link, I'll do this. I just hope that extensive engine damage hasn't been done by my relative putting the green coolant in (i still don't know if there is green Mercedes coolant), as I would like to hold on to and maintain the vehicle.