Larry,
I don't know what coolant you were using, or are still using that you are adding Nalcool to, but I am being advised that unless you use an Antifreeze/coolant with a phosphate corrosion inhibitor (all green coolant except Sierra), you don't need to add Nalcool, or any other similar additive to it.
The current (pardon the pun..) antifreeze/coolants that have Organic Acid corrosion inhibitors (Amber, Orange, Red) do not cause electrolytic cavitation.
This is just one more very good reason not to use a green coolant in your Mercedes.
Johnson,
You're too late, CJ changed the coolant already!
s60,
The variety of colors have to do with different auto manufacturers specs, and people's ability to describe color. Whether you call it amber as my local Mercedes dealer does, or red, as the local Saturn dealer does, or pink, or ocre, they are all advanced technology coolants that do not contain phosphates, and may, or may no contain varying levels of silicates. A representative of Valvoline told me that there are actually over 15 different colors of coolants. One shade to match your mood on any given day.
Lim,
I'm still looking into this blue coolant. So far, I have only heard from one person who has ever seen it, and they couldn't say if it was MB coolant or not. Did you buy it from a Mercedes dealer? Do other Mercedes owners in Malaysia also use it? Perhaps it is a European, or Asian only product. The products used by MBUSA, and sold in the US are supposedly different than the European products. Hey, how about taking a picture of this blue stuff and posting it here so we can all see it?
Perhaps one of our members in Europe and AustralAsia can tell us what color the coolant is that they use over there. I will email a couple of them and ask them to comment.
For my addational comments and synopsis, go to my thread called, Red v Green, Part Deaux...