Motul Gear Competition 75W-140 in Transmission and Diff - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

JBezugs · 03-14-2018, 04:46 PM

EDIT: Mods I realized I posted this in the wrong forum, I have now posted it in the maintenance sub forum. Feel free to delete if desired.

Hey guys,

About a month and a half ago I went to a local performance shop to swap out the factory fill of trans and diff fluid for something a bit better (at about 18k kms).

I know that many in the community use Motul Gear 300, so when my mechanic recommended Gear Competition I really didn't think twice about it. He said its his go to recommendation for Subaru's (WRX's, STI's BRZ's and FRSes) and has used it many times in the past so I trusted his word.

Now upon doing more research about it, I am getting worried that I may be doing harm to my trans/diff. Should I flush and fill with a 75W-90?

CSG Mike · 03-14-2018, 08:29 PM

Fine in both, but you may find reduced mpg and increased notchiness shifting.

Teseo · 03-14-2018, 08:36 PM

Quote:

Originally Posted by CSG Mike

Fine in both, but you may find reduced mpg and increased notchiness shifting.

On cold temps right? Because on warm or driven for a while shifting improve dramatically

CSG Mike · 03-14-2018, 10:46 PM

Ultimately it's not what's recommended by the manufacturer. I don't believe it will hurt the car *short term*

Your car, your risk.

JBezugs · 03-15-2018, 10:30 AM

Quote:

Originally Posted by CSG Mike

Ultimately it's not what's recommended by the manufacturer. I don't believe it will hurt the car *short term*

Your car, your risk.

Noted. I may keep this fill then until my next interval and switch to Gear 300 after that. I haven’t noticed anything out of the ordinary; it is notchier than the stock fluid in the cold (below 5 deg C) when nothing has warmed up, but I double clutch on upshifts and downshifts when the car is cold anyways.

Otherwise the shifter feels better than the stock fluid once up to temp.

As an aside, I know second gear can be “crunchy” in this car from time to time, but I also get the odd bit of synchro noise when shifting to third as well (fairly rarely, maybe once on a 45 min commute). I had this issue with the stock fluid as well. Does anyone else have this issue?

humfrz · 03-15-2018, 12:51 PM

Quote:

Originally Posted by JBezugs

Noted. I may keep this fill then until my next interval and switch to Gear 300 after that. I haven’t noticed anything out of the ordinary; it is notchier than the stock fluid in the cold (below 5 deg C) when nothing has warmed up, but I double clutch on upshifts and downshifts when the car is cold anyways.

Otherwise the shifter feels better than the stock fluid once up to temp.

As an aside, I know second gear can be “crunchy” in this car from time to time, but I also get the odd bit of synchro noise when shifting to third as well (fairly rarely, maybe once on a 45 min commute). I had this issue with the stock fluid as well. Does anyone else have this issue?

Yes, sometimes ...... if I get "lazy leg" ...... don't push the clutch pedal all the way to the floor ......

humfrz

JBezugs · 03-15-2018, 04:55 PM

Quote:

Originally Posted by humfrz

Yes, sometimes ...... if I get "lazy leg" ...... don't push the clutch pedal all the way to the floor ......

humfrz

Fair enough! I may be doing the same without realizing it...

03-14-2018, 04:46 PM	#1
JBezugs Good Job Subaru! Join Date: Mar 2016 Drives: '17 BRZ, '24 CX-50 Location: Toronto, Ontario, Canada Posts: 353 Thanks: 146 Thanked 334 Times in 156 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Motul Gear Competition 75W-140 in Transmission and Diff EDIT: Mods I realized I posted this in the wrong forum, I have now posted it in the maintenance sub forum. Feel free to delete if desired. Hey guys, About a month and a half ago I went to a local performance shop to swap out the factory fill of trans and diff fluid for something a bit better (at about 18k kms). I know that many in the community use Motul Gear 300, so when my mechanic recommended Gear Competition I really didn't think twice about it. He said its his go to recommendation for Subaru's (WRX's, STI's BRZ's and FRSes) and has used it many times in the past so I trusted his word. Now upon doing more research about it, I am getting worried that I may be doing harm to my trans/diff. Should I flush and fill with a 75W-90? __________________ My (no longer Green) 2017 BRZ Build Thread Last edited by JBezugs; 03-14-2018 at 07:57 PM.

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03-14-2018, 08:29 PM	#2
CSG Mike Join Date: Jul 2012 Drives: S2000 CR Location: Orange County Posts: 14,561 Thanks: 8,941 Thanked 14,211 Times in 6,854 Posts Mentioned: 970 Post(s) Tagged: 14 Thread(s)	Fine in both, but you may find reduced mpg and increased notchiness shifting.

03-14-2018, 10:46 PM	#4
CSG Mike Join Date: Jul 2012 Drives: S2000 CR Location: Orange County Posts: 14,561 Thanks: 8,941 Thanked 14,211 Times in 6,854 Posts Mentioned: 970 Post(s) Tagged: 14 Thread(s)	Ultimately it's not what's recommended by the manufacturer. I don't believe it will hurt the car short term Your car, your risk.

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