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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 10-12-2012, 06:48 PM   #1
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500 Mile - Complete fluid change

We hit 500miles today, and decided to do a complete fluid change before we hit the track this weekend.

Some of the goods we used.


Removed the OEM oil filter with K&N high performance filter.
The filter is slightly taller by about 1/4"
The oil was fairly clean, with no unusual contaminants. The magnetic drain plug did a good job collecting small particulates.
We used exactly 5.5 quarts of Amsoil 0w20.


Remove the Undertray to access the transmission.


Remove drain and fill plugs:


Transmission had a good amount of particulates that came out...normal for a new tran. Oil was dark brown still translucent.
Helps if your trans is warm for the fluid to drain easily.
We used about 2.6 quarts of Redline MT90


Next is the rear diff.


Also helps here to warm up the fluid to drain more easily.
You can see how much small particulates collected on the magnetic drain plug.
We used about 1.25 quarts of the Motul Gear 300


.....ready for the track!
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Old 10-12-2012, 08:11 PM   #2
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Is subaru gear oil as used in STI transmission OK for BMZ tansmission?
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Old 10-12-2012, 10:45 PM   #3
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I had some grunge on the diff plug as well. I suspect the next change will have less on it.
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Old 10-12-2012, 10:49 PM   #4
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Wondering if extra s is working well in this missions.
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Old 10-12-2012, 11:49 PM   #5
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Your choices of fluid changes are exactly the same as mine, except I stuck with an OEM filter. Just happy to see this combo used at a professional shop!
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Old 10-12-2012, 11:56 PM   #6
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Any change in shifting notchiness with that fluid?
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Old 10-13-2012, 07:21 AM   #7
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I'm using the MT-90 in my transmission as well, and there was an improvement in shift quality. Not a huge one, but noticeable. To be honest it shifted pretty good to start with. I've noticed now that the temperatures are starting to dip under freezing overnight, the 1-2 shift is a little stiff until I've put a few miles on the car. I'm very tempted to try gmookher's suggestion of the Pentosin MTF2 (75W80) fluid for the winter.
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Old 10-14-2012, 05:54 PM   #8
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For those that are asking, the STI specs GF5 and you want a GF4 in a BRZ transmission. GF5 is fine for the rear. Extra-S is GF5.

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Old 10-14-2012, 09:56 PM   #9
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Just changed my diff fluid with Motul Gear 300 also. Still debating as to which tranny fluid to use.
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Old 10-15-2012, 11:03 AM   #10
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Quote:
Originally Posted by michaelahess View Post
Any change in shifting notchiness with that fluid?
The notchiness of the transmission didn't change. Fluids won't change that.
That slight grind from 1st to 2nd... I didn't notice this until the weather here started dipping into the 40's in the morning (even with the OEM fluids). After the first shift, it's perfect every gear with the MT90.
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Old 10-15-2012, 11:05 AM   #11
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Quote:
Originally Posted by roddy View Post
I'm using the MT-90 in my transmission as well, and there was an improvement in shift quality. Not a huge one, but noticeable. To be honest it shifted pretty good to start with. I've noticed now that the temperatures are starting to dip under freezing overnight, the 1-2 shift is a little stiff until I've put a few miles on the car. I'm very tempted to try gmookher's suggestion of the Pentosin MTF2 (75W80) fluid for the winter.
You could try the MT-85 (75w85)
We had this in our Evo's in the winter, and honestly with chicago temps dropping below 0 at times - it's just in the matter of the fluids getting up to temp.
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Old 10-15-2012, 12:46 PM   #12
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Quote:
Originally Posted by Skye View Post
Is subaru gear oil as used in STI transmission OK for BMZ tansmission?
No, the AWD design Subaru uses means the tranny case also houses the front differential. The front diff is a hypoid design and needs the GL-5 requirements. Our FRS/BRZ transmissions are just that, transmission only. Some of the GL-5 stuff could deteriorate brass synchros, etc. Use something GL-4 rated.
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Old 10-15-2012, 01:18 PM   #13
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What kind of bolts are the drain/fill plugs? I can't tell if they are squares, torx, or triple squares.
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Old 10-15-2012, 01:28 PM   #14
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People have been talking about significant brake fade; you didn't mention switching to performance brake fluid ???
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