Good old Google:
What is Hypoid?
The term "hypoid" has more to do with the construction of engine gears than it does with oil. Early automotive engineering involved gears that meshed with each other straight on. When you think of gears, this flat face-to-face gear teeth approach is what we learned as kids in cartoons and marketing images of big machinery. However, automotive design soon figured out this gear approach was inefficient and also very loud when running. Thus, the "hypoid" design was invented which basically has two gears shaped like Christmas trees mesh with each other at 90 degree angles or similar.
The hypoid approach reduced gear-meshing noise and it allowed greater torque pressure for stronger drive. The design was so successful every car and vehicle today uses it as a standard transmission design. Due to the higher pressure on gears as a result, the lubrication needed has to include ingredients to provide more protection for the gears. This special gear oil is designed not to deconstruct under higher pressure.
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[SIGPIC][/SIGPIC]2016 Newmar Dutch Star 4369
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USAF 1966-1969,- Law Enforcement 1969 - 2003, Retired since March 2003
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