coolent is presurised and will not boil at 100deg and it could be normal to go up to 110deg depending on your system and rad cap pressure.
i would start at 110deg for your coolent and 90-100 for your oil
i cant see your engine will go any higher than that in normal operation
a chap at work who does all the contract work for our engines at work said the normal diesel 15w-40 we use was still working fine at 180deg in some of thair lab tests when thay where looking into the quality of oil we use.
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