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Mechanical Maintenance (Oil, Fluids, Break-In, Servicing) Everything related to the mechanical maintenance of the FR-S and BRZ |
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07-11-2022, 07:12 PM | #15 | |
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Ball or roller bearings used in manual transmissions don't run different tolerances to suit different oil viscosity to my knowledge. People have reported draining the stock LV fluid after a couple of autocross events and it comes out grey and watery. Changing to something thicker fixes the issue. I'm not taking a chance on it with a brand new car. I don't care about the 0.1% better fuel economy. I want the extra protection. |
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07-15-2022, 10:20 PM | #16 |
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Id back that statement up. The manufacturers are all about their corporate average fuel economy, so if they can convince those in power that thinner trans oil will net them lower fuel usesage, they will do it as long as most transmissions last the warranty period.
I don't use 0w20 or 0w16. I run 5w30 synthetic in my engine for the same reason.
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07-19-2022, 11:20 PM | #17 |
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I thought the use of the thinner fluid was to deal with shifting issues when cold (not really fuel economy). If we beat car hard (track, autocross, etc.) then maybe 75W90 might provide better protection (for higher heat scenarios).
Guessing... then again, not all 75W90's are the same, and I hated my factory fill. Valvoline 75w90 refresh was even worse. The other 75w90's I tried were ok, but slightly thinner has given me better results (oil mix). Hopefully, some other soul tests such mixes/brands to ease our minds. |
07-20-2022, 01:26 AM | #18 | |
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FWIW Valvoline doesn’t make a 75w90 additized for synchronized manual transmissions, so not surprised it shifted poorly. This has nothing to do with GL5 mind you as most, if not all, GL5 gear oils are yellow metal safe now and have been for over a decade. |
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07-21-2022, 06:34 AM | #19 |
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07-21-2022, 06:36 AM | #20 | |
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I'm not saying go out and put 75w-90 in but I think Redline MTL 75w-80 and MT-85 75w-85 would both be great options. |
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07-22-2022, 05:12 PM | #21 | |
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https://forums.nasioc.com/forums/sho....php?t=2933689 |
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07-22-2022, 07:18 PM | #22 | |
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07-22-2022, 07:32 PM | #23 |
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Mostly correct. Subaru dealers here will install their 75w80 during a service. From the factory won’t know until we, at least, get a uoa from a 2022+. But, I’d wager they are all getting Subarus from the factory since they control production and the transmission is Subaru. All else I agree with and would support Redline MTL. I would not run anything below 9CST in these given the lack of evidence of a major redesign of the unit. 75w90 make sense for track use.
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07-24-2022, 01:21 AM | #24 | |
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See attached image straight from the Subaru BRZ Owner's manual. The fluid you referred to that's factory fill in some other Subaru models that is 9CSt at 100C is not used in the BRZ. The BRZ Uses Toyota LV 75W which is thinner. |
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07-24-2022, 05:21 PM | #25 | |
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07-24-2022, 10:05 PM | #26 | |
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You said LV fluid is 9CSt at 100C. It isn’t. That’s a different fluid. Some (or even many) dealers may well use Subaru 75w-80 fluid for servicing but that is not the LV fluid. |
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The Following User Says Thank You to bradsm87 For This Useful Post: | DarkSunrise (12-03-2022) |
08-01-2022, 10:30 AM | #27 |
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Good discussion, people. I'm looking forward to learning more about this. I have a bunch of fluid for my now-defunct first generation BRZ and wonder if I should be using it when my second generation car shows up in a few months.
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