The recommended coolant (G13), when diluted 50/50 has a boiling point of 228° F (109° C) at atmospheric pressure and 248° F (130° C) at 15 PSIG (roughly 2 bar or twice atmospheric pressure). The actual gauge is controlled by the ECU and is filtered to read 190° F anywhere in that range (to avoid causing concern at the temperature varies in normal operation). Normal operating temperatures for a VW diesels are in the range of 170° F to 210° F with the thermostat set to open around 190° F. The data sheet for the coolant should have a curve for different concentrations and pressures (although 50/50 and 15 PSIG is very standard). But assuming a fairly standard coolant, diluted 50/50 with water, and a 15 PSIG cap you're looking at around 265° F or 130° C before things start to boil. The actual value will depend on the coolant that you're running, the concentration, and the setting of the pressure cap.
Shell DEX- COOLis suitable for a five year or 150,000 mile service life in automotive applications. Far enough below the coolant's boiling point that you don't need to worry about what happens when you shut the engine down (and you loose coolant flow, but still have a lot of residual heat). Extended Life Antifreeze Shell DEX-COOLExtended Life Antifreeze/Coolant is a single-phase, ethylene glycol based, extended life, universal automotive engine coolant based on a unique extended life carboxylate inhibitor system.
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