The "Pour Point" of engine oil is about -44ºF.
The cross reference for m-4864 which is a hydraulic oil or transmission fluid is SAE 80 for below freezing temperatures. B (SAE 90) is used for temperatures that are above freezing.
The freezing point for Peanut Oil is 3 °C (37.4 °F).
No, it become unusable at that point. Gasoline has a considerably lower flash point than hydraulic oil, and hydraulic oil gets heated when it is in use.
Under normal conditions no because the hydraulic fluid is usually oil based. In conditions that are not normal like space or lab conditions that are beyond normal temperature yes there could be a chance, but very unlikely.
Pure water freezes at 320F, O0C. Mineral water in the UK means a still or carbonated water that contains beneficial dissolved salts in low concentration. The freezing point of this would be slightly lower than pure water. (Depression of the freezing point due non volatile solutes)
Hydraulic fluid and hydraulic oil are one in the same.
hydraulic oil
emolliating hydraulic oil in the lowest part of the hydraulic system.
Lower than -18 c as I have tried.
Hydraulic oil and hydraulic fluid are different. Hydraulic fluid is used in small systems such as car brakes. Hydraulic oil is used in large systems such as loaders.
ISO Grade 68 flashpoint is 430 degrees F
The freezing point of water is 273.15 K. The difference between them is 14.15 K.