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Valkyrie Riders Cruiser Club > General > General Board > Shaft drive Gear oil
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Author Topic: Shaft drive Gear oil  (Read 284 times)
Knapdog
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South Wales, UK
« on: February 22, 2026, 05:59:12 AM »
I'm about to change the gear oil. I believe I need 150ml.
I currently have these two on the shelf.
Could I use either of these or should I be getting something else?
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98valk
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South Jersey
« Reply #1 on: February 22, 2026, 06:22:15 AM »
    
How to select a good gear oil based on VI index.
« on: March 30, 2020, 11:41:52 AM »
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https://www.machinerylubrication.com/Read/28956/lubricant-viscosity-index

High or Low Viscosity Index needed?

If conditions are not constant (variable loads, variable speeds, variable ambient temperatures, etc.), then there is a need for not only the optimum viscosity but also a high viscosity index to stabilize the optimum viscosity. The more variable the conditions, the greater the need for high VI oils.

https://www.valkyrieforum.com/bbs/index.php/topic,110541.0.html
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Knapdog
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Posts: 358


South Wales, UK
« Reply #2 on: February 22, 2026, 06:42:05 AM »
Quote from: 98valk on February 22, 2026, 06:22:15 AM
   
How to select a good gear oil based on VI index.
« on: March 30, 2020, 11:41:52 AM »
   Reply with quoteQuote Modify messageModify Remove messageRemove
https://www.machinerylubrication.com/Read/28956/lubricant-viscosity-index

High or Low Viscosity Index needed?

If conditions are not constant (variable loads, variable speeds, variable ambient temperatures, etc.), then there is a need for not only the optimum viscosity but also a high viscosity index to stabilize the optimum viscosity. The more variable the conditions, the greater the need for high VI oils.

https://www.valkyrieforum.com/bbs/index.php/topic,110541.0.html

The only way I'm able to reply to that is the manual says SAE 80. I ride in normal temperatures from 10°C in Spring to possibly, if I go down to Southern Spain...35°C.
So, sorry, I'm none the wiser
Will either of my two oils above suffice? One is GL4 Mineral and the other is GL5 Semi Synthetic.
« Last Edit: February 22, 2026, 07:00:35 AM by Knapdog » Logged
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Challenger
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« Reply #3 on: February 22, 2026, 08:02:55 AM »
Never went to oil school but have never had a problem with gear oil. Put in the GL-5 and ride!
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Knapdog
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South Wales, UK
« Reply #4 on: February 22, 2026, 08:15:24 AM »
Quote from: Challenger on February 22, 2026, 08:02:55 AM
Never went to oil school but have never had a problem with gear oil. Put in the GL-5 and ride!

Much obliged.
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GiG
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« Reply #5 on: February 22, 2026, 11:01:07 AM »
Quote from: Challenger on February 22, 2026, 08:02:55 AM
Never went to oil school but have never had a problem with gear oil. Put in the GL-5 and ride!

Yes, weather extremes encountered on a motorcycle do not warrant any concern about
Viscosity- pick one of your stock oils and ride!  angel
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sandy
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Mesa, AZ.
« Reply #6 on: February 22, 2026, 01:25:10 PM »
Quote from: Challenger on February 22, 2026, 08:02:55 AM
Never went to oil school but have never had a problem with gear oil. Put in the GL-5 and ride!

+1 on the GL5. The exact volume isn’t as important as the fill point. Level the bike and fill till it runs out the fill port.
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Chrisj CMA
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Crestview (Panhandle) Florida
« Reply #7 on: February 23, 2026, 05:40:13 AM »
Quote from: sandy on February 22, 2026, 01:25:10 PM
Quote from: Challenger on February 22, 2026, 08:02:55 AM
Never went to oil school but have never had a problem with gear oil. Put in the GL-5 and ride!

+1 on the GL5. The exact volume isn’t as important as the fill point. Level the bike and fill till it runs out the fill port.

If you drain and fill the drive when it’s off the bike you don’t have to make a disgusting mess by overflowing it. Synthetic lube will last tire to tire
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