Motul gear 300 or Redline MT90?

[fenixv8]

ok cool thanks I was just a little confused by the "API Standards: API GL-4/GL-5"
on the website.

[Hanakuso]

Originally Posted by AZP Installs

+1 That is correct.

-Mike Paisan

What would you recommend if budget wasn't a priority?

[AZP Installs]

Originally Posted by Hanakuso

What would you recommend if budget wasn't a priority?

Budget is always a priority in my book as that is part of the game

But in actuality we would and do use the Motul Gear 300 75w90 for both the trans and rear diffys in the Subarus and the BRZ/FRS. The LS we used in my CTS-V rear Diffy because it had a mechanical rear LS as well as in other applications where there is a mechanical LS Diffy.

-Mike Paisan


11+ Years Maintaining, Modifying and Educating TriState Subaru Enthusiasts.
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[AZP Installs]

As a followup, if they decide to put one of the mechanical rear diffys in the car next year, then the recommendation would change completely for obvious reasons.

-mike

[fenixv8]

Engine Tranny and Diff, Motul 300v 0w20 and Motul Gear 300 75w90 yesterday after break in period. Shifting much smoother in the cold now. Thanks for the advise Hanakuso and AZP Installs.

[SXE10]

Originally Posted by SXE10
Just use a GL5 designed for an LSD & you'll be right.

Originally Posted by gmookher

Whatever you do , do NOT use a GL5 in the transmission
It calls for a GL3 which has been superceded by GL4
however it does not work the same way b/w GL4 and GL5
GL5 is fine in the diff
forget SAE spec. consider the actual oil used and its viscosity

If you'd read the above posts you would have seen we were talking about the diff, not the transmission. Hence the mention of Limited Slip Differential

As you where.

[flippy]

Originally Posted by SXE10

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

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

hatters gonna hat

[Draco-REX]

Originally Posted by Nardi330

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.

I didn't see an answer to your question.

Yes. Those gaps in the bushings are specifily to reduce noise and vibration. By filling those gaps, and using a material with a higher durometer you are making it easier for vibrations from the diff to transfer to the body. As you add more and more hardened/poly bushings, you'll get more Noise, Vibration, Harshness (NVH) in the cabin.

[KslayFRZ]

I had motul put on my trans at 36k... now it grinds to high Hell when d shifting into 5th

Sent from my SPH-L900 using Tapatalk

[KslayFRZ]

Switched to amsoil.... f ing amazing

[IronDuke]

I known this is a dead thread, but I just hit 1000 miles and put Red line MT90 in my MT, just because I've always changed out fluids on all my vehicles after the break in period. I used to own a Jeep Wrangler and Redline works very well with them, so I figured why not. Well gears 1-3 are very grindy now. I've ordered Motul and will post the results. The MT90 was very thin and after reading the label it states it can be used as engine oil 10w- 40, wtf?

Update: I put the Motul in yesterday, and it's much easier to shift now compared to OEM and Redline.

[mhughett]

Originally Posted by IronDuke

I known this is a dead thread, but I just hit 1000 miles and put Red line MT90 in my MT, just because I've always changed out fluids on all my vehicles after the break in period. I used to own a Jeep Wrangler and Redline works very well with them, so I figured why not. Well gears 1-3 are very grindy now. I've ordered Motul and will post the results. The MT90 was very thin and after reading the label it states it can be used as engine oil 10w- 40, wtf?

The viscosity ratings on gear oil aren't the same as those for engine motor oil. You are correct that the 75w-90 wt for gear oil is roughly equivalent to 10w40 motor oil. I used MT90 on my son's Mazda3 and it works great. I tried Motul on this car and found it to be pretty notchy, especially in the mornings. I've since tried a 50/50 blend of Motul and Royal Purple Synchromax and this is the best formula so far. I've gone through the winter and also gotten it up to track temperatures and overall, it is the best. YMMV.

[sato]

Originally Posted by KslayFRZ

I had motul put on my trans at 36k... now it grinds to high Hell when d shifting into 5th

Sent from my SPH-L900 using Tapatalk

They put Valvoline on my transmission at the dealership and it did the exact same thing...

[MikeyBatz]

I have about 10,000 miles on my frs and looking to change the transmission fluid. Would you guys recommend doing a full flush or just a simple drain and fill?