I have posted this before but in the UK the current MB coolant is dark blue, at least it was when I bought a few pints from MB in West London about 9 months ago.
So anyone in the UK - don't panic if you don't have orange or red coolant!
But I do agree with previous posters, use the correct MB stuff for your region. Cylinder heads are expensive and a damaged one could ruin your whole day!

1994 E200 Wagon 115k miles