I agree with Wasuchi on the oil, any brand with has the API "C" classification (for Diesel engines) would work fine, IMO.
On the coolant, well, your not going to really "wreck" anything by using a namebrand coolant. The MB coolant isn't terribly expensive. It is different looking (kind of a yellowish color) and lots of people here swear by it. If there is a dealer convenient to you, I'd say get a price on it and compare. If there isn't one close to you, use any good name brand coolant.
Gilly
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