Simple question. If it’s a GL-5 gear lube is it a Hypoid gear oil? I noticed many 80w90 GL-5 gear oils don’t list “Hypoid “ on the bottle, but I always thought they are. Thanks.
GL-5 = Hypoid ?
- Thread starter Jimiii
- Start date
Short answer. Yes.
https://en.wikipedia.org/wiki/Gear_oil
API Category GL-5 designates the type of service characteristic of gears, particularly hypoids in automotive axles under high-speed and/or low-speed, high-torque conditions.
API Category GL-5 designates the type of service characteristic of gears, particularly hypoids in automotive axles under high-speed and/or low-speed, high-torque conditions.
Thanks. Just looking to confirm
MolaKule
Staff member
"GL-5; Specified for hypoid gear service but with shock loads and severe service operation. Usually meets Mil-L-2105D and in most cases, is the multipurpose automotive gear oil. Most 75W90 to 75W140 grades meet the GL-5 classification. This grade has a high level of Extreme-Pressure additives. Most of the modern GL-5 lubes contain metal deactivators that prevents attacks by the extreme-pressure additives. In addition to EP additives, these lubes contain rust inhibitors, defoamants, friction modifiers, thickeners, and Viscosity Index Improvers."
What does this mean? GL-4 is not fine for hypoid gearing.
a dual rated gear oil with both gl-4, gl-5 is however.
It means what I said. GL4 is hypoid oil too.