FRS/BRZ Manual Trans Fluid
 

Hey guys,

I'm just curious on what kind of MT fluid you guys are using on your FRS/BRZ?

Any recommendations on which one is the best for our brass synchros?

There is really only good oil to run. Amsoil Manual Synchromesh. Its non corrosive to yellow.

Really good stuff. I've switch all of our BRZ FRS cars into this oil. Also helps in the first gear bump in.

Don

If you don't have this local to you let me know. I sell Amsoil at 15% off Retail.

Royal Purple Synchromax. Though the amsoil don recommended is just as good.

Correct me if I'm wrong but I think their are 3rd party tests showing the RP is in fact corrosive on yellow parts even though they say it is not. They found that some of the newer brass used is much softer and more corrosive. Don't know if the Aiisin has this kind of brass. And its getting to be quite expensive. I think its $17+ now a quart.

I have seen a few blackstone reports and do not recall seeing any reviews that noted corrosion from RP, but that's not to say it has not happened.

will this work for diff oil too?

Diff Oil is 75w90. Little bit different.

I put Redline MTL into mine recently. It's shifting incredibly well now, was pretty stiff trying to get into second on the stock fluid. (MTL is a bit thinner than the stock stuff. I wouldn't expect the transmission to hold a lot of torque with MTL in it...)

Probably going to try the Motul Gear300 stuff next, just because you can use it in both the tranny and the rear end (so I hear...) I hate trying to rinse all the gear oil out of my Motive power fill bottle before doing the transmission, and I'm sure as hell not going to buy another one.

We have had very good results with both Amsoil and Motul Gear 300. By the way, selling for 15% off retail as a reseller of Amsoil products voids your dealership....

-Mike Paisan

AZP's First Private Track Event, June 19 at NJMP Thunderbolt $315 including Classroom and Mentor!
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11+ Years Maintaining, Modifying and Educating TriState Subaru Enthusiasts.
Call directly as We carry almost every manufacturer now, so before you buy parts call us.
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Switched mine over to Amsoil Syncromesh in the gearbox and Amsoil Severe Gear 75w-90 in the diff. Made the swap around 1700 miles, I have over 4000 miles now.

Not an Amsoil fan for reasons associated with the business, but their products are usually very good.
I have nothing but good things to say about the swap. Swapping the diff fluid really helped with some noise from the rear end, especially when making tight low speed turns.

First and second gear are much smoother when cold. Syncromesh is thin enough to allow for smooth shifting when cold, but thick enough to still offer protection when hot. I'd do the swap over again, and probably use the same fluid. Best I could get locally without resorting to mail order.

Thanks for the suggestions guys! If you guys have anymore post them up :)

I'm running Motul Gear 300 in the trans and diff, very happy with it and the bottles come with a built in fill nipple which makes it that much nicer to do. Seriously I'd pay extra for these bottles if I had to.

Thanks I was confused I see that others have said that the put Motul Gear 300 on both so I was confused!!!

I will like to buy some but I dont know if shipping will be expencive to Puerto Rico because I believe you cant use USPS that is the cheapest way for me to get parts.

I'm running Millers Motorsport CRX 75w90 NT in the trans and diff

Great stuff if you track your car.

Some gear oils meet GF5 and GF4 and Motul Gear 300 is one of them.

http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=729255#Post7292 55

-Dennis

I agree, so I transplanted the nipple from the Motul bottle (which I put in the diff.) to the Pentosin bottle to fill the trans. Worked nicely with no need for a transfer pump.

http://i252.photobucket.com/albums/h...ps54e87250.png

http://i252.photobucket.com/albums/h...psf5e01239.png

I've been using Pentosin MTF2 for about 8500 miles. I noticed an immediate improvement in shift quality. Good stuff.

once my last free oil change is done from dealership ill be switching all fluids with Motul.... Goodspeed will be doing all of my maintenance once my last oil change

Motul Gear 300 all day. Our transmission shifts real nice now.

So let me get this straight because I keep reading conflicting stuff. Can I use Motul Gear 300 in the Tranny, and differential?

Yes.

Thanks for this thread, I found a deal on ebay for 6 quarts for $70 shipped. Its very convenient doing two cars and being able to use the same oil for diff and manual gear box.

FYI Motul 300 is a little on the thick side compared with some of the other popular choices.

I'm doing MT-85 tranny fluid change tomorrow along with the Perrin shift rod bushing. Hope it would make a big difference in shift feel.

jack stands or lift?

Jack stands. Don't have a lift. Is that a concern?

I changed trans oil a few days ago with jackstands and the bushing looked somewhat difficult to remove. I was thinking of installing the Perrin bushing myself but not sure it'll be worth the trouble. Let me know how you make out.

Since you are local to us, let us know if we can help you out if you can't DIY.

-Mike Paisan

AZP's First Private Track Event, June 19 at NJMP Thunderbolt $315 including Classroom and Mentor!
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11+ Years Maintaining, Modifying and Educating TriState Subaru Enthusiasts.
Call directly as We carry almost every manufacturer now, so before you buy parts call us.
Like us on Facebook! | E-mail: sales@azpinstalls.com | 725 Fairfield Ave | Kenilworth, NJ 07033 | 908.248.AZP1 (2971) | T-1 Certified Amsoil Direct Jobber |AIM: AZP Installs
"Race Tested, Enthusiast Approved!"

I did mine with the jack stand over the weekend. Definitely doable. Of course someone with a lift will have a much easier time.

I don't mean to thread jack but how are you liking the bushing? Is there a noticeable difference?

:threadjacked:

I'm running Motul 300 in the tranny and diff. It's ok, still notchy. The biggest benefit came after I installed the Perrin Shift Bushing, now that's a mod that's worth its weight in gold.

Thanks for all the suggestion guys! Keep'em coming

I changed both the fluid and bushing at the same time and have driven the car one time since. It does feel before than before but I can't say it makes a dramatic difference. For the price I think its worth it and its easy enough to do.

Absolutely.

We use Gear300LS in our diff; it slightly alters the engagement characteristic of the differential.

I've put ~200mi on the Pentosin fill and I've got to say I'm not that crazy about it. It feels too thin ... wish I went with something a little thicker like Torco MTF or Amsoil MSTF.

I'm running the Motul Gear 300 in the trans and dif. The first 4500km (2800mi) was great- then one morning the car just wouldn't go into 1st. Not at all. Had to warm up the car and then it would barely shift into 1st, but most of the time it would feel like the gate was closed. It has been a week since that time and I'm usually able to get into first now but its very notchy in 1st, and somewhat notchy getting into second.

How long does the Motul Gear 300 last between changes? I was planning to change the fluid once a season, but at this rate it looks like I might need to change every oil change?!

Same t hing with me i changed to motul 300 for diff and tranny and in mornings cold my first and second are hard to shift.. I'm gonna switch to amsoil is thinner and better