Originally Posted By: Quattro Pete
By the same token you could say that a 30 grade is really a 20 grade or even a 10 grade "in between full cold and full hot," but so what?
Trying to follow Merkava's flawed logic, I noticed I made a mistake in the above statement. It should have said:
Quote:
By the same token you could say that a 30 grade is really a 40 grade or even a 50 grade "in between full cold and full hot," but so what?
Still, I repeat, this train of thought goes nowhere. The whole SAE grading system is based on a reference temperature (100C), and not "in between full cold and full hot."
The other reference temperature is for the "Xw", so it is -35C, -30C, -25C, -20C, and -15C for 0w, 5w, 10w, 15w, and 20w, respectively.