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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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03-26-2019, 08:32 AM
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#1 |
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So 2017+ models CAN use GL-5 fluids in the tranny...
I want to change my transmission fluid so I started to do my homework on this and went through countless transmission fluid threads of recommendations and people warning against using GL-5... but they were all pre-2017.
An AMSOIL rep (through a clerk at an auto store) insisted that the AMSOIL 75W90 Severe Gear GL-5 will work for my BRZ and will not let me special order their regular manual transmission fluid. I was going through my owner's manual and this was stated under Manual Transmission, "Other gear oil that meets APL GL-3, GL-4, or GL-5 and SAE 75W-90 specifications." So... I guess Subaru updated the '17+ transmission to allow for GL-5 usage now? |
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03-26-2019, 09:28 AM
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#2 |
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Wes
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I guess? Been using it in mine for a while now
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03-26-2019, 01:27 PM
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#3 |
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義理チョコ
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Interesting. Seems kinda sketch. The transmission hasn't changed at all.
Not arguing with the manual but I'd stick with GL-4.
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03-26-2019, 01:55 PM
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#4 |
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Panda Trueno
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Personally, I'd go by what the book recommends (look in your manual). Not sure if there is an update, but definitely haven't read about one.
Also, I wouldn't trust the clerk at an auto parts store. |
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| The Following User Says Thank You to Summerwolf For This Useful Post: | wparsons (03-29-2019) |
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03-26-2019, 08:52 PM
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#5 |
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Only users lose drugs.
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Kind of like when manufacturers change nothing in a transmission, but yet suddenly one year it's now "filled for life"..
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| The Following User Says Thank You to venturaII For This Useful Post: | Spuds (03-28-2019) |
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03-27-2019, 09:39 PM
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#6 |
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Subaru only has GL-5 now as their OEM manual transmission fluid.
I emailed Subaru of America several times to confirm that it's OK to use Subaru OEM oil that states GL-5. Is there a chance that the customer support guy didn't know what he was talking about? Possible! But when in doubt, Red Line is always there for you! Sent from a potato |
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03-28-2019, 03:44 AM
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#7 |
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Last generation GL5 transmission fluids have additives that protect yellow parts of the gearbox thus even when manufacturers say only GL4 a GL5 oil can be used, for example Gear 300 IS GL5 but protects yellow gearbox parts that ask for <GL4
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03-28-2019, 01:52 PM
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#8 |
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Only users lose drugs.
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This article has been cited in the past plenty of times, but is still an excellent explanation of why GL5 ratings are NOT compatible for transmissions using brass syncronizers...nor are they meant to be. Written by a knowledgeable regular over at BITOG, in this case for the Corvair community. Brass is still brass though, regardless of it being in a '65 Corvair or a '15 Toyota...
https://www.widman.biz/uploads/Transaxle_oil.pdf
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Last edited by venturaII; 03-29-2019 at 09:24 AM. |
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| The Following User Says Thank You to venturaII For This Useful Post: | Spuds (03-28-2019) |
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03-28-2019, 03:19 PM
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#9 | |
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The Dictater
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Quote:
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| The Following User Says Thank You to Spuds For This Useful Post: | venturaII (03-28-2019) |
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03-28-2019, 03:25 PM
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#10 | |
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Quote:
Sent from a potato |
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