Correct answer
From the manufacturer’s specifications for that engine.
From the engine design and manufacturer specifications. There is no single ideal temperature for every engine; the DGT mechanics manual describes indicative values of 85–100°C, varying by engine. Cold-engine temperature depends on the surroundings. Do not confuse coolant temperature with combustion-gas temperature or claim the latter is always 300°C.
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From the manufacturer’s specifications for that engine.
It must always be between 85 and 90°C, regardless of engine.
It must always equal combustion-gas temperature.
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