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W140 S600 300D300SD
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226 Posts
Discussion Starter #1
hello folks, i just replaced my gear oil w/ castrol hypoid-B gear oil, b'coz the mechanic told me i cant use ordinary gear oil, my question is why do i need to use the hypoid-b? will using ordinary gear oil really damage my differential?
 

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94 s420 98 s420
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539 Posts
Iam not sure what hypoid oil is however i would assume its due to the speed and temperature in that differential. oils break down at certain temps and loose their lubrication abilty, maybe this oil can withstand higher temperatures.
 

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Premium Member
1997 S600 (sold)
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4,660 Posts
Google turned this up. He seems to know what he's talking about.

http://yarchive.net/car/hypoid_gear_oil.html

Seems any GL-5 rated oil is proper for hypoid gear lubrication.

Brett
 

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W140 S600 300D300SD
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226 Posts
Discussion Starter #4
thanks for the info dude, the mechanic said that my car has a limited slip differential thats why i need to use hypoid b gear oil otherwise using ordiary gear oil will not make my differential function lkike its not linited-slip further on it will damage my differential, i wonder can use this hypoid b in my 123 and 126?
 

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600SEL
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1,089 Posts
Your car doesn't have limited slip differential. It has ASR instead. The reason for using hypoid oil is because it has hypoid gears.
Here is a good explanation:
http://groups-beta.google.com/group/rec.autos.tech/browse_thread/thread/8ccf66f3b91b8b4d
 
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