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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.

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Old 03-31-2017, 12:23 AM   #1
aaguirre123
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Driven Transmission Fluid

Since I bought my 2013 FRS I've had problems with my manual transmission. It was grinding when on 5th gear when I shift above 5,000 rpm. I showed this to the dealer and they reluctantly replaced my transmission. The head mechanic there was lecturing me in how should I drive the car. He indicated that I should drive less aggressively. Yeah right.

After some miles on the new transmission it was grinding on 4th instead of 5th. I tried fixing it myself by changing transmission fluid with Toyota, Subaru, Mobil, RedLine and Amsoil. All of them were 75W-90. All of them did not solve the problem. 44,000 some miles later I was ready to give up on this car. But before doing that I decided to give it one more try.

I contacted Speed, Jr and he recommended Driven Oil STF. I read the online description and it stated "Recommended for manual transmissions that require automatic transmission fluid, multi-viscosity or straight grade motor oil." Automatic Transmission fluid? What? Despite that it did not specify that it is a 75W-90 like OEM recommended I decided to use it.

It works. It actually works. No more grinding on shifting to 4th or 5th. I emailed Speed, Jr to give more details about their product but did not go in detail in regards to the secret sauce.

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Old 03-31-2017, 11:41 PM   #2
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Looking at the MSDS, it starts off relatively thick and gets very thin.

As it's not the proper spec for the transmission, any future warranty issues could be an issue...
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Old 04-01-2017, 12:49 AM   #3
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Oh, just enjoy your smooth shifting transmission ....... but, you might consider saving up for a new transmission ......


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Old 04-03-2017, 06:40 PM   #4
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April Fools I hope.
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