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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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Old 08-05-2020, 07:16 AM   #29
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Originally Posted by rice_classic View Post
Both are good but the syncromesh from amsoil is full synthetic so when things get hot and fast the oil will prevent the synchro from adequately slowing down the gear and youíll get a crunch. This is in track/racing scenarios.

I like the 75-110 but I race on the 75-90
Thanks for the reply. The reason why I ask is because I also have a Honda S2000 which i believe to also have a Aisin transmission. I was able to use amsoil syncromesh in that hence I figured I can in the BRZ. From my reading, all syncromesh fluid (5-30) is lighter than 75-90 which is what our transmission specs.

In regards to the diff, why go lighter in track situations where temps are higher?
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Old 08-06-2020, 09:25 AM   #30
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Thanks for the reply. The reason why I ask is because I also have a Honda S2000 which i believe to also have a Aisin transmission. I was able to use amsoil syncromesh in that hence I figured I can in the BRZ. From my reading, all syncromesh fluid (5-30) is lighter than 75-90 which is what our transmission specs.

In regards to the diff, why go lighter in track situations where temps are higher?
The wear isnít happening nor do I have a fancy lsd that needs thicker fluid, and thicker fluids can also contribute to higher temps. It wasnít a Ďsolutioní for me. On the advice of csg Mike and allowable by the T4 rules, I just installed the greddy diff cover so Iím looking forward to see how that improves the life of the diff fluid.
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Old 08-06-2020, 03:41 PM   #31
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Pentosin MTF2 (75w80, GL-4) in the Gearbox, Motul 300 (75w90) in the diff. NOT LSD oil. There are no clutch discs in there.
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Old 09-07-2020, 02:03 AM   #32
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Just wanted to ask if the motul 300 is still recommened on a boosted manual brz? Or would you guys recommend something else?

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Old 11-12-2020, 10:15 PM   #33
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Absolutely not in the Diff! Just about any synthetic 75-90 gear oil in the diff. Iím partial to amsoil and motul for Diff
Is this the stuff you use?

https://www.walmart.com/ip/PENNZOIL-...g-FP/744954333

It needs 3qts for transmission and 1qt for the diff right?

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Old 11-12-2020, 10:41 PM   #34
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Op, what do you do?

If just normal DD, any brand will do.
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Old 11-13-2020, 03:06 AM   #35
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Is this the stuff you use?

https://www.walmart.com/ip/PENNZOIL-...g-FP/744954333

It needs 3qts for transmission and 1qt for the diff right?

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Thats the stuff!

Its a bit over 2 for the trans but DO NOT use it in the diff! It is NOT for use with hypoid gears like a differential, please use a synthetic gl-5 75w-90 in the diff
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Old 11-17-2020, 11:03 PM   #36
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Thats the stuff!



Its a bit over 2 for the trans but DO NOT use it in the diff! It is NOT for use with hypoid gears like a differential, please use a synthetic gl-5 75w-90 in the diff
Does the built in spout work or did you need a fluid transfer pump?

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Old 11-18-2020, 12:04 AM   #37
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Does the built in spout work or did you need a fluid transfer pump?

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For trans I use a funnel and tube, fill from above. Diff, I use a pump.
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Old 11-22-2020, 03:53 AM   #38
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I switched my tranny fluid out with MT-90 and found that it made some things better, and some things worst. On stock fluid, attempting to downshift from 5th to 4th aggressively at 3k+ rmps would lock me out 4th. Other than that, I found the stock fluid to be quite pleasant.

With Redline MT-90, upshifting to 3rd gear would result in a "clanking" sensation and noise, which did happen before, but much more rarely. Going from 1st to 2nd also is a bit more difficult if you shift sloppily, unless you mentally try and slot it in the gear in the perfect angle, then it is very smooth. However, the downshifting lockout issue has been fixed and overall shifts do feel a bit smoother, yet heavier if that makes sense.

I'm curious if others experienced similar results as me and do transmission break down and lose viscosity over time?
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Old 11-22-2020, 12:24 PM   #39
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Does the built in spout work or did you need a fluid transfer pump?

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I did my trans and diff a couple months ago using the built in spouts by crushing the bottles. A pump would have been easier, but not strictly necessary.
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