Water first @ 212 in open atmosphere but under the pressure determined by your radiator cap and mixed with anti freeze it's higher, like 240. If the pressure is released it's gonna boil right away. Hence the big release of steam, if you get a leak.
Motor oil boiling temps vary by oil types but it's in the range of 400 to 600+ degrees farenheit depending on the specific oil type, so don't expect your oil to boil too soon.
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