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Mechanical Maintenance (Oil, Fluids, Break-In, Servicing) Everything related to the mechanical maintenance of the FR-S and BRZ

View Poll Results: What Differential fluid is in your BRZ/FRS?
Amsoil Severe Gear Synthetic EP Gear Lube 75W-90 20 12.90%
Mobil 1 75W-90 synthetic gear lubricant LS 11 7.10%
Motul 300v 75w-90 76 49.03%
Redline 75W-90 NS GL-5 Gear Oil 19 12.26%
Dealer Brand 29 18.71%
Voters: 155. You may not vote on this poll

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Old 09-15-2012, 04:00 PM   #1
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What Differential fluid is in your BRZ/FRS?

Since we have a "What Brand of Oil is in your BRZ/FRS?" Poll, lets do one for diff fluid. Owner's Manual recommends API GL-5 and SAE 75W-85 or API GL-5 and SAE 75W-90 spec oil. Since we have a Torsen gear-type differential without clutches, we don't need or want friction modifer(FM)?

What are you using and the reasoning? When did you swap the fluid?
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Old 09-15-2012, 08:05 PM   #2
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Redline 75W85. I changed the gear oil around 1200 miles, iirc. The drain plug is magnetic, and had a fair bit of metal stuck to it (looked like a fine grey paste). This is most likely due to the ring and pinion "taking a seat" to each other. I don't expect to see much on the 2nd change (likely next spring).
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Old 09-17-2012, 08:56 PM   #3
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Anyone used subaru extra-S?
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Old 09-18-2012, 01:31 AM   #4
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Amsoil 75w-110.
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Old 09-18-2012, 11:28 AM   #5
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Originally Posted by rice_classic View Post
Amsoil 75w-110.
this is good shit. i sued on all my previous car
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Old 11-04-2012, 02:43 PM   #6
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Red Line 75W85
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Old 11-08-2012, 11:48 AM   #7
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Ps - use this or 75W85.

Not the NS variant.
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Old 11-09-2012, 04:31 AM   #8
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I just replaced stock diff oil with Redline 75w90NS and it seems the LSD engages very easily. If I turn and take off in 1st gear at the same time, LSD seems to engage. I was letting off the clutch very slowly and balancing gently with the throttle on dry tarmac (ie not slippery surface) and im running on stock Michelin. It never seemed to do that with stock diff oil. Is this a good thing? Would LSD wear out more quickly? I'm sure the diff oil was filled up correctly.

I also fitted coilovers, changed gearbox oil with Redline MT90 and Whiteline subframe insert at the same time. I wouldn't think these would effect the LSD.

Anyone has the same thing after filling redline 75w90NS?

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Old 11-12-2012, 09:39 PM   #9
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Originally Posted by Skye View Post
Anyone used subaru extra-S?
The ExtraS is good but the Motul Gear 300 in our experience is as smooth or smoother, but since it's synthetic (unlike the ExtraS) it holds it's properties longer than the ExtraS.

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Old 11-12-2012, 09:57 PM   #10
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