Motul gear 300 or Redline MT90?
 

Definitely would avoid the Motul 300 for the trans(we aren't GL-5 rated), but it should be excellent in the diff(what I'm using). Make sure you just get the standard gear lube version though as we don't need the friction modifiers found in the LS version as we don't have a clutch diff.

For the trans I would(and I am) run Amsoil MTG. Proper GL-4 rated fluid that won't eat our syncros unlike what the dealer tried to sell me for a change. I tend to have a rather negative view of Redline as I feel they focus more on hitting the buzzwords than actually delivering a product.

Read around, check bobtheoilguy.com, and get informed. I suspect you will come to similar conclusions.

You also need to order all this crush washers/gaskets(the tranny uses two of the same):

2x M/T Fill plug gasket: 17008AA050
Rear Diff Fill plug gasket: 11126JB000
Rear Diff Drain plug gasket: 1215710010

Yes I like:
http://www.amsoil.com/StoreFront/ima..._qt_350pxh.jpg

Yup, very good stuff with a long and established record. :party0030:

thx,alot of reading.

looks like most people would recommend use redline MT-90 for transmission and motul 300 for diff?

Did you look into Redline MTL? I'm not sure if it's the correct oil for the gearbox on these cars or not, but if it is compatible, I'd highly recommend it, as it made a fantastic difference in cold weather shifting in some of my past cars.

+1! Like any forum though, you just need to filter out the noise.

Synchromesh Manual Transmission Lubricants.
Gear Tribology and Lubrication

I'm guessing that Motul claims Gear 300 meets both GL4 and GL5 because it may contain metal deactivators. I do not blend their gear oil, so maybe it would be best to ask Motul how they meet both specs. :D Or maybe Molakule at bitog can shed some light on this. He has blended gear oil and highly recommends Gear 300 for Subaru differentials.

-Dennis

is there a specified amount that goes into the transmission and differential, or just fill until it starts coming out of the fill hole for each?

It is a GL4/GL5 and it works great in the transmission. Some of the thinner oils might shift a bit better cold, but once the transmission comes up to operating temperature it gives you nice solid smooth shifts.

http://www.motul.com/system/product_...pdf?1303320907

We have serviced a lot cars locally and have not needed to replace the washers. It couldn't hurt to have them, but it really wasn't necessary, so don't pull your hair out running around to get them if you don't want to.

There is a spec in the book, something like 2.2 liters for transmission and 1.3 for differential. That being said once you get to the fill spec, the oil starts to come out of the filler hole so you know you are done.

so any complain about using motul for the trans from your customers?

Only positives so far. The only thing I can say is that since it is a 75w90 you can notice the transmission shift smoother once it comes up to temp. That being said even cold it is better than the factory. Once up to temp I have no doubt it is offering excellent protection to the transmission internals.

Does the change of diff oil to Motul Gear 300 make the LSD rougher than stock?

I changed to Redline 75w90NS recently and it's not as smooth as stock in low speed turns. Since Gear 300 is also without fiction modifier like the Redline 75w90NS, I wonder if its rough like Redline. If not I might replace Redline with Gear 300.

Since the limited slip in our cars is a Torsen unit and works with gears not a clutch pack...the presence/or not of a friction modifier should not have any effect on the operation of the limited slip in the BRZ/FR-S's.

That's what I thought too so I bought the Redline 75w90NS (no fiction modifier) but its now rough at low speed. I'm lost....

MT90 did wonders in my 6-speed Aisin equipped Miata.

go to motul 300, tracks great. quiet. ester based 100% synth

Red Line 75W85 in diff

i've got redline lightweight shockproof in my diff and transmission at the moment its working extremely well. though due to it liking metal i had my tranny flushed out and cleaned my diff out as well before adding the shockproof.

That's what I have in the gearbox. Seems to be good but I need more miles to confirm.

Seriously consider doing this now but I'll give the redline a few more days and see.

Smooth?

I heard bad things about shock proof so I guess I'd try Motul first. Thanks for your comment tho.

Very smooth

Thx. I guess maybe our diff needs fiction modifier.

Negative. We use a torsen. They are unaffected by FM. Thats for clutch packs.

I stopped using the redline stuff in my car after it was overheating on the track, even the MT-90 in my M3 tranny...good luck to you guys. Overheating is easy to read, increased solubles, and half the content..no thanks, but g'head in your car, not in mine.

Please remember its a racing fluid, group 3 base stock based. You know what that means.

As No Limit Motorsports said, the Motul Gear 300 works great in both the regular Subaru Transmissions as well as the BRZ/FRS units. We've installed quite a bit of it and it runs wonderful. We carry Redline products but over the years it has had very variable quality control. I since learned that RL doesn't produce their oils but re-brand other ones.

We also have used the Amsoil and love their gear and motor oils as well. You can't go wrong with either Motul or Amsoil in our book. We've been tracking and road racing subies for 10+ years using these fluids.

-Mike Paisan

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will be picking up some Motul Gear 300 75w90 in an hour and will replace the Redline 75w90NS which was put in last Friday. the roughness hasn't gone away so the car is now in the garage until Motul goes in just to make sure i don't cause any more damage.....

+1

on further thoughts, would fitting Whiteline rear subframe bush inserts transfer more diff vibration?

i changed oil and installed the bush inserts at the same time. does that make the diff feel more rough while standing start and turning at the same time? once the car rolls over at speed (2nd gear +) i don't really feel any harshness.

Mike,
Like most oil companies, Red Line is an oil blender. They purchase base stocks from one company and additives from another company. Amsoil even uses some ExxonMobil base stocks. There are literally only a handful of base stock suppliers and additive suppliers in the world.

-Dennis

right but some cost more than others for a reason
There is a reason motuls ester based stocks cost more

"Motul was the first lubricant manufacturer to use the ester technology for the formulation of its 100% synthetic car oils by capitalizing on an innovation first invented for the aviation industry. The vegetable-based esters benefit from lubricating properties, anti-shear quality and exceptional resistance to high temperatures."

http://en.wikipedia.org/wiki/Motul_%28company%29

I was planning to get some of the new ESTERCore 300V 0W-40 for my Forester and was quoted a price of $38 for a 2L can. :confused0068:Makes the current 300V seem like a bargain.

-Dennis

Why did you chose NS over MT-90 or even MT-85 & how exactly is it going to cause any damage?

Have you guys seen the Hotchiks FR-S? It's runs Redline 0w-20, MT-90 & 75w-90 it cleaned up at the 86Fest Autocross. Engine is totally stock. No issue with the redline oil there. They also took it to the Buttonwillow Raceway Global Time Attack http://youtu.be/a7ByVC_Y_8k

I've had MT-90 in my Altezza for @ 50K km & it still shifts as smooth as the day I put it in. Seems to me like this thread is turning into Motul vs Redline with lots of hatters, hearsay & a surprising lack of knowledge about the oil industry & only a few people talking any sense. But I guess that sums up most car forums :barf:

because MT-90 and MT-85 are GL4 oil. for the diff Toyota/Scion/Subaru specified GL5 oil. i chose 75w90NS because our LSD is a torsen and doesn't need fiction modifier that are in 75w80 and 75w90.

I can't determine the NS is causing any damage but prior to the oil change (it had the oil from factory), the LSD was smooth all the time. now there is very noticible gear noise with slight vibration while turning and standing start at the same time. i don't know if this is normal or not but to be on the safe side i'd prefer my diff to be smooth like it was prior to the oil change.

i also replaced stock gearbox oil with Redline MT-90 and it is much better than before and i gave credit to it. in no way am i bashing Redline over Motul but maybe i chose the wrong diff oil and should used the redline 75w90 with the fiction modifier in the first place. but i'm not going to take chance now as many have reported good result with Motul Gear 300 75w90 so that is what i'm going to use. i will report if the diff is smooth again once the redline is replaced.

if you have good knowledge about oil and stuff as you implied, maybe you can supply us with factual information to show that Redline 75w90NS is or isn't the correct oil for our LSD? i would defintely love to learn more. or maybe you can tell me why replacing stock diff oil with Redline 75w90NS caused the noise and vibration so that i know what's going on. at the moment, i can only go by trail and error.

Agreed, however the info I had was that RL is purely a marketer, not even a mixer of the fluids, so sometimes you get excellent results, other times not as good. You even get different colors of the fluid depending which batch it came from apparently.

Personally I love the RL High Temp ATF over anything else out there for AT cars and swear by it.

-Mike Paisan

http://www.pbase.com/paisan/image/91072632.jpg http://www.pbase.com/paisan/image/14...8/original.jpg http://www.pbase.com/paisan/image/133406601.jpg http://www.whiteline.com.au/images/logos/perf1.jpg
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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Dennis,

Stop by or shoot me an e-mail since we are a Motul Dealer I can get it for you and probably at a very reasonable price. :)

-Mike Paisan

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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
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:offtopic:
Maybe next time. I ordered some Red Line from a Subaru dealer with my Subaru bucks. My total out of pocket on 6 quarts of Red Line and six oil filters is $6.00. :D

I'll probably visit you next for some brake pads and we can discuss Motul vs. Red Line in the BRZ.:w00t:

-Dennis

You and your subie bucks!

I can't beat that price.

-Mike Paisan

http://www.pbase.com/paisan/image/91072632.jpg http://www.pbase.com/paisan/image/14...8/original.jpg http://www.pbase.com/paisan/image/133406601.jpg http://www.whiteline.com.au/images/logos/perf1.jpg
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
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:w00t:I'm putting Motul in mine on the weekend (Gearbox and Diff), and of course have the same add-ons as you do (Cusco and Perrin). Will let you know the results. I've seen one thread stating that the Perrin introduced some harshness into the driveline but that may or may not have been in conjunction with the Whiteline bushing.