Please don't allow this topic to become personal.
This is an excellent question and topic, with good information.

You need to be aware of the technically misleading title...
It is easy to become confused due to conversion, standards, where and how the temperature is measured, etc.

He is not suggesting sub ZERO, or what your body could sense as cold...

FYI:

30°C= 86°F

40°C= 104°F

I have clearly stated my technical concern in using the 30°C - 40°C spec.
This does not mean it is useless, many times I use it for preliminary - rough fill after a rebuild.

Here is a bit of technical fact trivia.
SAE (Society of Automotive Engineers) Laboratory standard ambient is assumed to be 70°F, unless explicitly defined for special testing.


I always have and always will point out the obvious facts.
* Do you own it?
* Do you pay the bills for it?
If both answers are yes, you are justified in taking the issue personally on your car.

If the answers are NO, please consider how antagonizing or offending the owner can possibly have a useful or good conclusion.


Have a great day.