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Bus Discussion => Bus Topics ( click here for quick start! ) => Topic started by: Flight102C3 on May 25, 2019, 05:41:06 AM

Title: Rear end gear lube
Post by: Flight102C3 on May 25, 2019, 05:41:06 AM
Good morning!  What are we using for gear oil in rear end? 80w 90. I have a 102C3
Title: Re: Rear end gear lube
Post by: Utahclaimjumper on May 25, 2019, 05:47:15 AM

75W90 Synthetic.>>>D
Title: Re: Rear end gear lube
Post by: Jim Eh. on May 26, 2019, 03:45:51 AM
Are you topping up or replacing?
Title: Re: Rear end gear lube
Post by: sledhead on May 26, 2019, 05:07:03 AM
so how many gallons are in there if I want to drain and change it ?

thanks   dave
Title: Re: Rear end gear lube
Post by: GnarlyBus on May 26, 2019, 09:37:25 AM
My MC9 has takes 4.5 gallons. The manual lists it right at then end of the rear axle chapter on the specs page. I'm getting a 5 gallon bucket when I do mine.
Title: Re: Rear end gear lube
Post by: luvrbus on May 26, 2019, 09:58:36 AM
Use the GL-5 rated 75/80 the GL-1 through GL-4 is old  school
Title: Re: Rear end gear lube
Post by: Iceni John on May 26, 2019, 08:19:08 PM
Quote from: luvrbus on May 26, 2019, 09:58:36 AM
Use the GL-5 rated 75/80 the GL-1 through GL-4 is old  school
I've been using GL-5 85W/140, which is what my Rockwell manual recommends for the temperatures here in SoCal.   I also use it for the front and rear hubs.   Is that OK?

John 
Title: Re: Rear end gear lube
Post by: chessie4905 on May 27, 2019, 04:58:34 AM
We used 90/140  Lubrication Engineers synthetic in our 4104. It flows like molasses at room temperature.
Title: Re: Rear end gear lube
Post by: Flight102C3 on June 06, 2019, 07:34:21 PM
Sorry ended up out of town working! Did wheel end work. Drained all. Thinking 80w90 old school. Thanks
Title: Re: Rear end gear lube
Post by: bevans6 on June 07, 2019, 08:11:48 AM
I like Lucas Hub Oil for oiled hubs, it is very persistent, sticks to the bearings, and resists leaking.  Gear oil has extreme pressure additives that aren't needed for roller bearings.  MCI recommends SAE 30 Engine Oil in the front hubs.
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