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Old 05-08-2015, 04:26 PM   #1
Jamez   Jamez is offline
 
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Question Transmission Fluid vs. Gear Oil?

I've searched around on the forums here and have yet to find a thread that covers this. If I missed it, I apologize. It's time for me to replace my trans fluid / gear oil and I'm a little confused. Gear Oil is much thicker and Trans Fluid is much lighter. But which one do I use? It sounds like for Scooters, located towards the back that you insert Gear Oil and NOT Transmission Fluid. My owner's manual says otherwise? :o

Can someone explain this to me?

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Old 05-08-2015, 05:40 PM   #2
bull   bull is offline
 
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In your manual just below #5 it says "Transmission 90". The 90 is a viscosity index and it is what is generally called 'Gear Oil'. You could use 75w90 and be fine. I use synthetic in all I service.

Transmission fluid as generally accepted term for autos is about 5 viscosity on older fluid types and less than that on new synthetics like +4 and such.
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Old 05-09-2015, 08:17 AM   #3
Jamez   Jamez is offline
 
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So Gear Oil and Not Transmission fluid?
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Old 05-10-2015, 02:54 AM   #4
Shadowfire   Shadowfire is offline
 
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The manual is quite specific. You want to use SAE 90 weight oil, which will almost certainly be sold as "gearbox oil" or "transmission oil".
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Old 05-10-2015, 10:18 AM   #5
Jamez   Jamez is offline
 
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Quote:
Originally Posted by Shadowfire View Post
The manual is quite specific. You want to use SAE 90 weight oil, which will almost certainly be sold as "gearbox oil" or "transmission oil".
Okay so I'll just search for SAE 90 and hopefully that solves my problem.
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Old 05-10-2015, 11:54 AM   #6
wheelbender6   wheelbender6 is offline
 
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Automatic Transmission fluid is basically hydraulic fluid. An auto transmission contains a hydraulic pump, so that the fluid can actuate different parts of the transmission. Auto transmission fluid is only able to adequately lubricate drive gears when placed under pressure by the hydraulic pump. That is why an auto transmission will very quickly wear out if the hydraulic pump goes bad or the seals wear out.
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Old 05-10-2015, 01:22 PM   #7
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Quote:
Originally Posted by Jamez View Post
Okay so I'll just search for SAE 90 and hopefully that solves my problem.
You won't have to search far.....any big box store, or your favorite auto parts place will have it....even comes in a one quart bottle with a little squirt top. That size bottle will be enough for about 5 changes.
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