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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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05-30-2021, 10:27 AM
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#1 |
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WRBLUE BRZ
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MT trans fluid spec
Hi guys.
I just want to know your opinion about API spec for our MT fluid as i searched a lot about it and found that many people said use GL-4 spec but when I go for owner manual. It said GL-3 or upper grade or even in the 2018 manual which i found in online also spec for API GL-3, 4 and 5. Does GL-5 really safe for the synchromesh?  
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05-30-2021, 03:28 PM
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#2 |
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I know people on here swear by Motul Gear 300 which is GL-5 but my transmission felt like complete trash with that fluid. It was like a 1990s domestic. I have had great luck going to Red Line MT-90 which is GL-4. What I remember from looking for answers was that GL-4 was better than GL-3 in every way but GL-5 is fundamentally different and can attack yellow metals.
https://bobistheoilguy.com/forums/th...vs-gl-5.37720/ |
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06-01-2021, 05:30 AM
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#3 |
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GL4 is fine for the gearbox, however GL5 is not recommended at all, do not use GL5 in the gearbox. GL5 for the differential only.
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| The Following User Says Thank You to sneaky_pete For This Useful Post: | Wally86 (06-03-2021) |
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06-01-2021, 06:41 AM
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#4 |
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Whats wrong with the factory fill??
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06-01-2021, 08:07 AM
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#5 | |
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Quote:
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| The Following User Says Thank You to Cephas For This Useful Post: | Wally86 (06-03-2021) |
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06-01-2021, 01:10 PM
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#6 | |
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Quote:
https://d23zpyj32c5wn3.cloudfront.ne...pdf?1492016023 That said, I don't think it's any better than stock for cold shifts. I use it primarily for the shear protection at the track, but if I was doing a lot of daily driving, I'd probably try something else (like the Redline MT90 you mentioned).
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