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Differential Fluid - Mobil 1

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Differential Fluid - Mobil 1

 
Old 06-01-2019, 10:00 AM
  #21  
 
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Originally Posted by jackmugen02 View Post
I use Amsoil in the transmission and 75w140 in the diff. Puddymod recommends 75w140 on both of my street S2000s. I do notice a whine sometimes, slowing down to a stop light, but my exhaust covers up anything else. Did you notice a whine with 75w140?
I didn't have any diff whine with 75w-140 nor 75w-110. It was just that with the 75w-140, I got slightly worse gas mileage on daily drives.
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Old 06-02-2019, 05:30 AM
  #22  
 
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Anyone know what temperature the differential reaches in summer driving? I'd use my IR thermometer if I could but my rear diffuser is in the way.

From Torsen:
Essentially, the heavier, thicker, or more viscous that the oil is, the better it lubricates (generally). It leaves a heavier film adhered to the surfaces being lubricated. This reduces friction. But, that means that a differential operating in 75W-140 oil will have fractionally less locking effect than the same unit operating in 75W-90. This difference is not night and day – the changes are subtle. But if you’re fine-tuning a race car, it does offer one more knob that you can turn. By the same token, lubricant formulation and additives used have a similar bearing on the matter.
-- Chuck

Last edited by Chuck S; 06-02-2019 at 05:33 AM.
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Old 06-02-2019, 01:20 PM
  #23  
 
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Originally Posted by bkowa092 View Post
Good Afternoon,

I've read a bunch of threads about what diff fluid to use, and I landed on Mobil 1 75-90 due to the availability of it. That being said, the only Mobil 1 75-90 I can find is the LS (limited slip) variant. Just making sure that it is safe to use this for my differential.

Thanks!
Why would you use an diff oil with additives that are not needed or usefull for a torsen diff.? Using such an oil is sub-optimal.
Get this one --> CASTROL SYNTRAX LONGLIFE 75W-140
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Old 06-02-2019, 01:31 PM
  #24  
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If it helps, i meassured about 70° C on the diff case after a run on the Autobahn, 220 Km/h + for more than 10 minutes. Oil in the diff was Castrol 75w-90.
But it was a very cold, drizzle night in October.
I will retry it and do a new meassure as soon as possible.
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Old 06-02-2019, 01:54 PM
  #25  
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Originally Posted by RussianHammer View Post
Here in Socal i use Motul 75-140 regularly. Just because of how hot it gets.
got a socal 'specialty' shop that you like to use over dealers to do maintenance, etc?

Thanks

-JR
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