When buying oil, what does the ';W'; stand for in 10W-40?

Weight.When buying oil, what does the ';W'; stand for in 10W-40?
He's rightWhen buying oil, what does the ';W'; stand for in 10W-40?
I believe it's weight.
Yes, the '; W '; stands for winter.... 10winter-40weight..... basically around a 10weight in the winter, 40 at operating temp.
weight...hope that helped!!
weight
weight
Its a SAE grading and it stands for ';Winter'; and relates to the oil viscosity at low temperatures.
weight...
Weight