I obtained a chart of 100C viscosities (cst) for the various SAE winter weight categories. It looks like this:
5W >3.8
10W > 4.1
15W > 5.6
20W > 5.6
25W > 9.3
30W > 9.3
So how does a 15W differe from a 20W? Why don't thy split the range (assuming 15W/20W run 5.6 to 9.29)? Is there a more subtle point that I am missing here?
5W >3.8
10W > 4.1
15W > 5.6
20W > 5.6
25W > 9.3
30W > 9.3
So how does a 15W differe from a 20W? Why don't thy split the range (assuming 15W/20W run 5.6 to 9.29)? Is there a more subtle point that I am missing here?