I believe your car has the same requirements as all other MB diesels. 80-100C is generally considered normal operating temperature, but these cars are designed to withstand up to 120C for brief periods. As far as coolant is concerned, it's prefered to use a neutral pH balanced coolant like MB coolant. It's also known as Zerex G05, available at Pep Boys or Autozone.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL