Interesting Viscosity Comparison Chart - Motor Oil VS Gear Oil
TT recommends 5w-50 oil in their low end transmissions and the chart below shows how motor oil compares to gear oil. Notice that the low number Winter viscosity oils [ 0W,5W,10W,15W] still correspond to basically 75 wt gear lube and the 50 side [ the viscosity flow at 210 degrees ] of the motor oil is equivalent to 90 wt gear oil.
From Bob the oil guy's site
ow do all of these viscosity grades seem easier to understand? Okay, maybe not yet, so Table 5, a viscosity equivalent chart, provides a comparative illustration of all of the grades shown in tables 1 through 4. For example, the chart indicates that an SAE 50 engine oil and an SAE 90 gear oil are the same viscosity. This might surprise you if you think that gear oil is always thicker than engine oil. However, as Table 5 shows, they are nearly equivalent.