Thanks to Ali and Ethan for their kind assistance. Both of you could be correct that my C240 might have come from the factory with the bluish color coolant. It sure is strange though. I've had quite a few MB's but this is the first time I'm hearing about colored coolant. Usually, it is clear in a white gallon container. Just playing safe to minimize the possibility of future expensive replacement of a radiator.
In the event I decide to flush out the coolant, is the location of the drain plug on the engine block similarly located at the right side (of the engine block) as in the 300E? How about the air purge plug, is it also on the top of the block?
Thanks again!

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Josemin


88 MB 300E
88 MB 560SEL
99 MB ML 430