Trans oil

Start oil threads here so they can be ignored and/or ridiculed by most of us (except for those hardcore few that live for that kinda stuff).
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Here's the place for you to debate what oil is best. Post your oil related topics her so we don't clutter up the other sections. Most people avoid oil threads like the plague.
E.scott
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Trans oil

Post by E.scott » Sun Jun 25, 2017 9:20 pm

I quite suspect this has been covered numerous times so my apologies in advance. I've been using recommended 20/50 motor oil in transmission since I've got the bike but just inherited a case of 80w/90 gear oil from my father's garage. Any opinions (sure there are) on if this is an ok/better solution to the 20/50 motor oil. Seems like a waste to chuck it and my transmission would be a great home for it.
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Re: Trans oil

Post by vetsurginc » Sun Jun 25, 2017 9:26 pm

It would also keep your final drive full for a long time.
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Re: Trans oil

Post by chaos2 » Sun Jun 25, 2017 9:48 pm

My dealer recommended 80-90 when I had some shifting issues so I'm pretty sure it wouldn't harm anything. Didn't really notice any difference shifting until I switched to synthetics.
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Re: Trans oil

Post by hotflash44 » Mon Jun 26, 2017 7:51 am

i switched to redline in everything and in regards to the trans ,it shifts perfect with just a firm click between gears. I use the toe shift method and feel that the good feel i get with toe vs the heal does contribute to the good shifting. Many will disagree im sure!
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Re: Trans oil

Post by rivers » Tue Jun 27, 2017 12:27 pm

You could trade it for a case of proper spec lube.
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Re: Trans oil

Post by Peter Pan » Tue Jun 27, 2017 1:58 pm

On the Spanish forum they say in hot summer sae 80/90 in transmission would work well too, (better then 20/50 due to the heat they have in South Spain)
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Re: Trans oil

Post by hillbillybob » Sun Jul 09, 2017 7:43 am

You don't need engine oil to lubricate a gear box......run the 80w/90 gear oil in your transmission....that's what it was formulated for.
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Re: Trans oil

Post by Bilgekeeldave » Sun Jul 09, 2017 9:27 am

The factory recommends 20W /50 motor oil for the transmission, that is what the transmission was designed to use a lubricant, anything else could cause problems.
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Re: Trans oil

Post by rivers » Sun Jul 09, 2017 1:32 pm

hillbillybob wrote:You don't need engine oil to lubricate a gear box......run the 80w/90 gear oil in your transmission....that's what it was formulated for.
Granted that's why it's called "gear lube" and works well for keeping gear wear to a minimum. There's more to gear box than just gears. Ural gear wear wouldn't be my major concern. Bearing wear would be though. Don't know if 90w will get in and out of the bearings easily enough to lube and remove heat? The prettiest gears in the world doan mean nothin if the bearings are frozen. :(
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Re: Trans oil

Post by hillbillybob » Mon Jul 10, 2017 6:38 am

There are countless billions of bearings, in all types of equipment, being properly lubricated by gear oil. A bearing is a bearing, whether it's in a Ural, a BMW, a Toyota Pickup, a John Deere, or whatever. Please take the time to read the 2 paragraphs below. (copied from Amsoil website)

Gear Oil and Motor Oil Are Not the Same

Gear oil differs from motor oil. While many motorists may assume SAE 90 gear oil is thicker than SAE 40 or 50 motor oil, they are actually the same viscosity; the difference is in the additives.

Motor oil contains additives such as detergents and dispersants to combat byproduct chemicals from gasoline or diesel ignition. Because an internal combustion engine has an oil pump and lubricates the bearings with a hydrodynamic film, extreme-pressure additives such as those used in gear oils are not necessary.

Motor oils and gear oils both have anti-wear additives, and they both must lubricate, cool and protect components, but gear oils may be placed under extreme amounts of pressure, creating a propensity for boundary lubrication, a condition in which a full-fluid lubricating film is not present between two rubbing surfaces. For example, differentials in cars and trucks have a ring-and-pinion hypoid gear set. A hypoid gear set can experience boundary lubrication, pressures and sliding action that can wipe most of the lubricant off the gears. To combat this extreme environment, extreme-pressure additives are incorporated into the oil. AMSOIL synthetic gear oils are formulated with an extra treatment of extreme-pressure additives in order to reduce wear and extend gear and bearing life.


As far as our transmission being designed to use 20w/50.....not.....there was no such thing in those days.
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Re: Trans oil

Post by hotflash44 » Mon Jul 10, 2017 7:49 am

Be interesting to try and remember before modern multi weight oils what Ural recommended in the transmission. According to the Amsoil article a straight weight oil would not have the a lubrication capabilities needed for gears. Just think how many Uralistas use motor oil in the transmission, don't think i see catastrophic Ural transmission failures. Whats up, is my question, are both sides of this subject confused? P.S. after running in the engine on my 2016 i switched to Redline trans,engine, and final drive, only time will tell me if i made the right choice.
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Re: Trans oil

Post by Bilgekeeldave » Mon Jul 10, 2017 10:20 am

MGs required motor oil in their transmissions. If you put gear oil in them they would become difficult to shift. I don't know how many people brought me poor shifting MGBs and all I had to do was flush the transmission and put motor oil in them and they shifted like new.

Don't put heavy gear oil in a transmission designed to run motor oil as a lubricant.
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Re: Trans oil

Post by hillbillybob » Wed Jul 12, 2017 7:46 pm

"Don't put heavy gear oil in a transmission designed to run motor oil as a lubricant."

It is a misconception that gear oil will somehow damage your tranny. An 80w/90 gear oil, is no heavier than a 20w/50 motor oil.....they have almost identical viscosities.
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Re: Trans oil

Post by Bilgekeeldave » Wed Jul 12, 2017 10:02 pm

I'm just speaking from experience. Transmissions designed for motor oil lubricant shift like crap with gear oil in them.
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Re: Trans oil

Post by Ironhand » Thu Jul 13, 2017 7:48 am

Bilgekeeldave wrote:I'm just speaking from experience. Transmissions designed for motor oil lubricant shift like crap with gear oil in them.
That's the big question in my mind. Was the Ural transmission designed to run 20w50? Doesn't the Euro manual spec a gear oil for the trans? Same gearbox, no? Maybe its a "keep it simple for the 'Mericans" thing. I have been running gear oil in mine since the first oil change, and it shifts noticeably better than either of my buddies who stuck with 20w50.
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