75w140 in final gear oil? - Suzuki Volusia Forums : Intruder Volusia and Boulevard Forum

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Old 11-23-2012, 02:06 PM   #1 (permalink)
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Default 75w140 in final gear oil?

I'm changing the gear oil in my truch--Royal Purple 75w140 synthetic. I have extra and am wondering if I can use this in my C50's final drive? I have seen some say they use 75w90...
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Old 11-23-2012, 04:19 PM   #2 (permalink)
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I would not thats pretty thick stuff.
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Old 11-23-2012, 05:00 PM   #3 (permalink)
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Quote:
Originally Posted by Schmiddy View Post
I'm changing the gear oil in my truch--Royal Purple 75w140 synthetic. I have extra and am wondering if I can use this in my C50's final drive? I have seen some say they use 75w90...
I would stick with the 75w90.


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Old 11-23-2012, 05:46 PM   #4 (permalink)
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^^ Me too
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Old 11-23-2012, 09:09 PM   #5 (permalink)
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There is no need to use 75w140. 75w140 is made for trailer towing any 4wd with higher temps and loads.

75w90 will flow better to lube at your lower operating temp.
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Old 11-23-2012, 09:25 PM   #6 (permalink)
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Royal purple 75W90 and call it done.


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Old 11-24-2012, 08:29 AM   #7 (permalink)
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Quote:
Originally Posted by Schmiddy View Post
I'm changing the gear oil in my truch--Royal Purple 75w140 synthetic. I have extra and am wondering if I can use this in my C50's final drive? I have seen some say they use 75w90...
"I feel",,,"my thoughts are",,,"I see" all famous last oil topic words.

If you want to increase the fuel mileage 0.2 mpg then run the thinner stuff. Any of y'all ever (physically) felt how hot these drives operate? Can't hardy touch them after 30 miles on the interstate using dino oil.

Schmiddy, you are down South. Run the thick stuff and don't think twice. All it's doing is lubing a few bearings and keeping the metal gears from touching.
It's not like the rear end oil has to be shared with the engine. I just had to say that.
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Old 11-25-2012, 12:31 PM   #8 (permalink)
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Quote:
Originally Posted by Hi-Vis View Post
"I feel",,,"my thoughts are",,,"I see" all famous last oil topic words.

If you want to increase the fuel mileage 0.2 mpg then run the thinner stuff. Any of y'all ever (physically) felt how hot these drives operate? Can't hardy touch them after 30 miles on the interstate using dino oil.

Schmiddy, you are down South. Run the thick stuff and don't think twice. All it's doing is lubing a few bearings and keeping the metal gears from touching.
It's not like the rear end oil has to be shared with the engine. I just had to say that.
I've never had a hot final drive...hot drum a few times, but never the drive.
That said, my philosophy for the rear is the same as the engine, run the heaviest lube it'll take. So I run 20/50 in the crankcase with oil stabilizer and I run 250 in the pumpkin with no issues.
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