Gear
oil viscosity numbers are similar to aviation oil numbers, which are generally 2x the normal engine oil ratings.
NOTE3: Do not think of
oil viscosity numbers in terms of thicker or thinner... Flow rate is modified by means other than the how thick or thin it is.
Not exact matches
The second
number denotes the
viscosity of the
oil when measured at 100degC (or 212degF).
The
viscosity of your
oil in colder weather is indicated by the first
number in the
oil specification, with a lower
number indicating better
viscosity in cold weather.