Welcome to the North American Subaru Impreza Owners Club Thursday March 28, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Service & Maintenance

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 07-23-2018, 10:26 PM   #51
ricardo381
Scooby Newbie
 
Member#: 59615
Join Date: Apr 2004
Chapter/Region: SCIC
Location: Los Angeles, CA, USA
Vehicle:
2013 WRX 5-door
WR Blue Pearl

Default

Drove with the new HPGO for a week and 3rd gear is still grinding when I upshift from 2nd. No issues when downshifting from 4th to 3rd gear, though. Is my 3rd gear synchronizer busted? No other issues with drivability other than brief grinding when upshifting from 2nd to 3rd. Is this type of issue common with the 5MT? Is the only option to drop and open up the gearbox to repair?
* Registered users of the site do not see these ads.
ricardo381 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 07-24-2018, 11:36 AM   #52
scoobydooluth
Scooby Newbie
 
Member#: 382724
Join Date: Feb 2014
Chapter/Region: MWSOC
Location: MN
Vehicle:
09 WRX Sedan
SWP

Default

Quote:
Originally Posted by alanlcit View Post
I have a 2005 STi with 146000 miles.

I replaced Amsoil Severe Gear (which I used from 57k to 87k) in 2010 with Motul Gear 300, again, at 87k miles. I have been running it without replacement ever since.
Quote:
Originally Posted by alanlcit View Post
I did not want to be replacing transmission fluid frequently (ever!), so I was looking for a solid choice I could put in and forget about.
Wait...so you're right around 60k now on that tranny fluid, and not planning to change it? Pretty sure that fluid is due already, even if you don't fall in the "severe" conditions (which, realistically, most people do) - in which case you're overdue by double.


Quote:
Originally Posted by ricardo381 View Post
Drove with the new HPGO for a week and 3rd gear is still grinding when I upshift from 2nd. No issues when downshifting from 4th to 3rd gear, though. Is my 3rd gear synchronizer busted? No other issues with drivability other than brief grinding when upshifting from 2nd to 3rd. Is this type of issue common with the 5MT? Is the only option to drop and open up the gearbox to repair?
How severe of a grind? Like a little "zip" sort of feeling on the shifter as the gear engages, or a big audible crunch?
Mine does just a little bit of that "zip" feeling - incidentally only on the 2->3 shift as well. Uncertain of the answer on whether this means a synchro is actually dickered, or just getting a little weaker, or common/normal for the 5MT. Any warranty left on yours?
FWIW, with my situation, I don't plan to have the tranny opened until it becomes an actual problem.
scoobydooluth is offline   Reply With Quote
Old 07-24-2018, 03:36 PM   #53
todd_fuller
Scooby Newbie
 
Member#: 79004
Join Date: Jan 2005
Chapter/Region: TXIC
Location: Austin, TX
Vehicle:
2005 Impreza WRX STi
Crystal Grey

Default

Quote:
Originally Posted by alanlcit View Post
I have a 2005 STi with 146000 miles.
To add some data points for anyone else searching.

I'm boat as you, '05 STi with ~140k miles. @ 120k I changed the transmission oil to HPGO from whatever the dealer did at 60k (I assume ExtraS). The HPGO was terrible. Lots of downshift grinding when there never previously was. Changed to Motul Gear 300... smooth as butter. I'm a believer. I'll be putting another bunch of Motul in the tranny if I still have the car at 180k.
todd_fuller is offline   Reply With Quote
Old 07-24-2018, 09:43 PM   #54
ricardo381
Scooby Newbie
 
Member#: 59615
Join Date: Apr 2004
Chapter/Region: SCIC
Location: Los Angeles, CA, USA
Vehicle:
2013 WRX 5-door
WR Blue Pearl

Default

Quote:
Originally Posted by scoobydooluth View Post
How severe of a grind? Like a little "zip" sort of feeling on the shifter as the gear engages, or a big audible crunch?
Mine does just a little bit of that "zip" feeling - incidentally only on the 2->3 shift as well. Uncertain of the answer on whether this means a synchro is actually dickered, or just getting a little weaker, or common/normal for the 5MT. Any warranty left on yours?
FWIW, with my situation, I don't plan to have the tranny opened until it becomes an actual problem.
I'm getting a small audible crunch when I upshift from 2-3. No more powertrain warranty. After reading through the forums, it looks like I can give Motul Gear 300 75w-90 a shot @ 4L for $100. If it works to eliminate the grinding when upshifting from 2-3, great! If not, I'll probably just drive it until it's time to open up the gearbox for repair and clutch replacement. Anyone have input on the Motul? Thanks!
ricardo381 is offline   Reply With Quote
Old 07-24-2018, 10:20 PM   #55
f22boy
Scooby Newbie
 
Member#: 464019
Join Date: Mar 2017
Location: NC
Vehicle:
2017 Wrx
ISM

Default

Adding my $.02 in...from what I read the oe fluid is made/bottled by valvoline, and so I just went with their full synthetic 75w90. That was 27ish k ago with no issues, and I drive hard and often.
f22boy is offline   Reply With Quote
Old 07-24-2018, 11:21 PM   #56
ricardo381
Scooby Newbie
 
Member#: 59615
Join Date: Apr 2004
Chapter/Region: SCIC
Location: Los Angeles, CA, USA
Vehicle:
2013 WRX 5-door
WR Blue Pearl

Default

Quote:
Originally Posted by f22boy View Post
Adding my $.02 in...from what I read the oe fluid is made/bottled by valvoline, and so I just went with their full synthetic 75w90. That was 27ish k ago with no issues, and I drive hard and often.


With Valvoline, I know there is the option of their conventional 80w-90 HPGO at $25/gal, https://www.autozone.com/greases-and...gal/972913_0_0, or their 75w-90 full synthetic you mentioned at around $50/gal, https://www.autozone.com/greases-and...-oz/977482_0_0.

I may try them all until something works rather than having to potentially repair the gearbox (last resort if it gets to the point of not being able to engage the gear) at this point of ownership.
ricardo381 is offline   Reply With Quote
Old 07-25-2018, 01:45 AM   #57
oaklandish_WRX
Scooby Specialist
 
Member#: 267339
Join Date: Dec 2010
Chapter/Region: BAIC
Location: Ostinato Rigore
Vehicle:
2002 0[[XXXXoXXXX]]0
MBP LongRoof

Default

Quote:
Originally Posted by f22boy View Post
Adding my $.02 in...from what I read the oe fluid is made/bottled by valvoline, and so I just went with their full synthetic 75w90. That was 27ish k ago with no issues, and I drive hard and often.
Care to share where the Valvo connection came from? Pretty sure the back of the bottles say idemitsu (also maker of OEM eng oil).

Also here. And also here.
oaklandish_WRX is offline   Reply With Quote
Old 07-25-2018, 07:32 AM   #58
f22boy
Scooby Newbie
 
Member#: 464019
Join Date: Mar 2017
Location: NC
Vehicle:
2017 Wrx
ISM

Default

Quote:
Originally Posted by oaklandish_WRX View Post
Care to share where the Valvo connection came from? Pretty sure the back of the bottles say idemitsu (also maker of OEM eng oil).



Also here. And also here.


Im not sure where I found it or if I bookmarked it last year but I’ll spend some time on lunch looking for it. If I cant run across it, ***129335;***127997;****9794;***65039; sorry I guess, but dont the six speeds work with pretty much anything.
f22boy is offline   Reply With Quote
Old 08-01-2018, 11:52 PM   #59
ricardo381
Scooby Newbie
 
Member#: 59615
Join Date: Apr 2004
Chapter/Region: SCIC
Location: Los Angeles, CA, USA
Vehicle:
2013 WRX 5-door
WR Blue Pearl

Default

Quote:
Originally Posted by ricardo381 View Post
I'm getting a small audible crunch when I upshift from 2-3. No more powertrain warranty. After reading through the forums, it looks like I can give Motul Gear 300 75w-90 a shot @ 4L for $100. If it works to eliminate the grinding when upshifting from 2-3, great! If not, I'll probably just drive it until it's time to open up the gearbox for repair and clutch replacement. Anyone have input on the Motul? Thanks!


I drained the Subaru HPGO and replaced with Motul Gear 300 75w-90. No more grinding. I wish started using this earlier. I hope this takes care of the issue for good.
ricardo381 is offline   Reply With Quote
Old 12-24-2018, 12:45 PM   #60
intermental
Scooby Newbie
 
Member#: 483844
Join Date: Mar 2018
Default

I will actually do this. Thank you.
intermental is offline   Reply With Quote
Old 01-04-2019, 08:32 AM   #61
SirBrass
Scooby Specialist
 
Member#: 207263
Join Date: Mar 2009
Chapter/Region: MWSOC
Location: Indianapolis area
Vehicle:
2019 WRX Limited
World Rally Blue

Default

Motul's Gear 300 75w90 is magic. Wonderful stuff. I ran it in my BRZ's 6MT and never had trouble shifting.
SirBrass is offline   Reply With Quote
Old 01-10-2019, 10:09 PM   #62
ricardo381
Scooby Newbie
 
Member#: 59615
Join Date: Apr 2004
Chapter/Region: SCIC
Location: Los Angeles, CA, USA
Vehicle:
2013 WRX 5-door
WR Blue Pearl

Default Tranny Fluid. Specifically Extra S Replacement. AKA Subaru High Performance Motor Oil

Quote:
Originally Posted by ricardo381 View Post
I drained the Subaru HPGO and replaced with Motul Gear 300 75w-90. No more grinding. I wish started using this earlier. I hope this takes care of the issue for good.


5,000 miles later and the grind when shifting to 3rd returns. Only at 50,000 miles but no more powertrain warranty because over 5 years. Out of ideas...may need to eventually take it to the $hop.
ricardo381 is offline   Reply With Quote
Old 01-15-2019, 06:45 AM   #63
slashnul
Scooby Newbie
 
Member#: 496475
Join Date: Jan 2019
Location: NorCal
Vehicle:
2007 Forester XT

Default

I just did my first transmission oil change, filling the dipstick tube after I removed the intercooler. Now Im shopping for intercooler gaskets. I hear some cars can fill at the gearshifter location once its removed. Know if that works with subarus?
slashnul is offline   Reply With Quote
Old 01-15-2019, 08:36 AM   #64
Charlie-III
NASIOC Supporter
 
Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: USA, North NJ, 07456
Vehicle:
1998 Legacy 2.5GT
Silver Sleeper BK, 5MT

Default

Quote:
Originally Posted by slashnul View Post
I hear some cars can fill at the gearshifter location once its removed. Know if that works with subarus?
I highly doubt it, you're thinking of a toploader trans which most/all Subaru MT's are not.
I just warm the trans lube before filling the trans. If warm and sunny out, I put the bottles on the driveway in the sun for an hour or so.
If colder out, I put the bottles on top of my furnace.
Charlie-III is offline   Reply With Quote
Old 01-21-2019, 07:33 PM   #65
ricardo381
Scooby Newbie
 
Member#: 59615
Join Date: Apr 2004
Chapter/Region: SCIC
Location: Los Angeles, CA, USA
Vehicle:
2013 WRX 5-door
WR Blue Pearl

Default

Quote:
Originally Posted by ricardo381 View Post
With Valvoline, I know there is the option of their conventional 80w-90 HPGO at $25/gal, https://www.autozone.com/greases-and...gal/972913_0_0, or their 75w-90 full synthetic you mentioned at around $50/gal, https://www.autozone.com/greases-and...-oz/977482_0_0.

I may try them all until something works rather than having to potentially repair the gearbox (last resort if it gets to the point of not being able to engage the gear) at this point of ownership.


Check out the rear label of the Valvoline 80w-90 HPGO. It mentions non-synchronized transmissions. So this wouldn’t be good for the WRX 5-speed?

ricardo381 is offline   Reply With Quote
Old 01-21-2019, 08:03 PM   #66
oaklandish_WRX
Scooby Specialist
 
Member#: 267339
Join Date: Dec 2010
Chapter/Region: BAIC
Location: Ostinato Rigore
Vehicle:
2002 0[[XXXXoXXXX]]0
MBP LongRoof

Default

Quote:
Originally Posted by ricardo381 View Post
Check out the rear label of the Valvoline 80w-90 HPGO. It mentions non-synchronized transmissions. So this wouldn’t be good for the WRX 5-speed?
Interesting...never seen that sort of specific warning... So, no, not for use in a subaru 5 speed MT. Their DuraBlend does not seem to have this warning. The info sheet for the white bottle (and also the full syn) indicates it already has LS additives, so that's no-go for synchros.
oaklandish_WRX is offline   Reply With Quote
Old 01-24-2019, 12:06 AM   #67
SubLGT
Scooby Specialist
 
Member#: 207528
Join Date: Apr 2009
Location: Idaho
Vehicle:
2005 Legacy GT

Default

Quote:
Originally Posted by ricardo381 View Post
5,000 miles later and the grind when shifting to 3rd returns. Only at 50,000 miles but no more powertrain warranty because over 5 years. Out of ideas...may need to eventually take it to the $hop.
Have you tried mixing some Redline Lightweight Shockproof with your gear oil?
SubLGT is offline   Reply With Quote
Old 01-24-2019, 10:38 PM   #68
ricardo381
Scooby Newbie
 
Member#: 59615
Join Date: Apr 2004
Chapter/Region: SCIC
Location: Los Angeles, CA, USA
Vehicle:
2013 WRX 5-door
WR Blue Pearl

Default

Quote:
Originally Posted by SubLGT View Post
Have you tried mixing some Redline Lightweight Shockproof with your gear oil?
I was searching through the forum and read about how some people had success with the Lightweight Shockproof but am reluctant to try it because it's not GL-5 rated. I may try it as a last resort if nothing else works.

The Motul website shows the GL-5 rated conventional GearBox 80W-90 (https://www.motul.com/us/en-US/products/gearbox-80w90) as one of the options for the 5MT in my WRX, so I drained out the Gear 300 75W-90 and replaced with 3L of the GearBox 80W-90. This stuff is milky black (Moly?) and thicker than any other gear oil I tried. It's marketed as Moly reinforced for "noisy" transmissions, so I'll try this stuff for awhile and report back if it helps...
ricardo381 is offline   Reply With Quote
Old 01-25-2019, 12:04 PM   #69
raisingAnarchy
Scooby Newbie
 
Member#: 408438
Join Date: Dec 2014
Location: OH, USA
Vehicle:
2016 WRX STi
CBS

Default

Dyson Analysis helped me out a lot with picking oils for my car. Could probably come out ahead financially sending a sample to him and buying his recommendation, vs buying 6 quarts of motul gear 300...
raisingAnarchy is offline   Reply With Quote
Old 01-25-2019, 06:57 PM   #70
SubLGT
Scooby Specialist
 
Member#: 207528
Join Date: Apr 2009
Location: Idaho
Vehicle:
2005 Legacy GT

Default

Quote:
Originally Posted by ricardo381 View Post
I was searching through the forum and read about how some people had success with the Lightweight Shockproof but am reluctant to try it because it's not GL-5 rated. I may try it as a last resort if nothing else works.
I think you would find this thread useful:

https://legacygt.com/forums/showthre...-200762p3.html

Pay special attention to the comments written by "BAC5.2". He has rebuilt hundreds of Subaru transmissions. Here is one post from him:

Quote:
As for Shockproof "eating synchros", that's a load of bollocks. I ran straight lightweight shockproof in my Forester for 100k, without any issues whatsoever. I've run it, and suggested it, for hundreds of Subarus without a single negative report. I've even torn down transmissions that have been running the Motul/Shockproof combo for a LONG time without any problems.

You should NOT use Synchromesh in a Subaru 5MT. Synchromesh is a fluid intended for gearboxes requiring GL-4 fluids. GL-4 fluids can't handle the shear loads seen in high offset hypoid gearsets (like our front differentials), and you'll see over time that fluid shears and wears the ring and pinion down to nothing in cars driven hard. I have a scar on my right index finger where a ring gear sliced through my glove.

Any GL4 fluid will cause this, not just Synchromesh. MT90, for example, will do the same thing. There was a small company who built kit race cars using the Subaru 5MT converted to FWD. They were running MT90, and were destroying front diffs after just a lap or two. They switched out to Motul/Shockproof and never had the issue again.

I've said for years, my preferred trans fluid setup is Motul and Lightweight Shockproof. It's what I recommend. As an alternative, I suggest Extra-S, Motul, or any other high quality synthetic. I don't recommend Royal Purple, Mobil 1, or Redline's 75W90NS, based on poor results. I am also a huge supporter of frequent fluid changes. I typically change my trans and rear diff fluid every 15-20k miles.
SubLGT is offline   Reply With Quote
Old 01-25-2019, 11:21 PM   #71
ricardo381
Scooby Newbie
 
Member#: 59615
Join Date: Apr 2004
Chapter/Region: SCIC
Location: Los Angeles, CA, USA
Vehicle:
2013 WRX 5-door
WR Blue Pearl

Default

Quote:
Originally Posted by SubLGT View Post
I think you would find this thread useful:

https://legacygt.com/forums/showthre...-200762p3.html

Pay special attention to the comments written by "BAC5.2". He has rebuilt hundreds of Subaru transmissions. Here is one post from him:
Thanks! The Motul GearBox 80W-90 quieted down the shift to/from 3rd gear quite a bit so I'll keep using it unless the grinding returns. I saved the 3L of Motul Gear 300 75W-90 since I only used it for 5,000 miles. I'll report back if issues persist or when I need to try 3 quarts of the Redline Lightweight Shockproof topped off with 1/4 quart of Motul Gear 300.
ricardo381 is offline   Reply With Quote
Old 01-27-2019, 06:54 PM   #72
Big-E
NASIOC Supporter
 
Member#: 123843
Join Date: Aug 2006
Chapter/Region: NESIC
Location: Connecticut
Vehicle:
2016 STI LTD CWP
Let LED's light your way!

Default

Big-E is offline   Reply With Quote
Old 01-28-2019, 12:36 AM   #73
ricardo381
Scooby Newbie
 
Member#: 59615
Join Date: Apr 2004
Chapter/Region: SCIC
Location: Los Angeles, CA, USA
Vehicle:
2013 WRX 5-door
WR Blue Pearl

Default

Quote:
Originally Posted by SubLGT View Post
Have you tried mixing some Redline Lightweight Shockproof with your gear oil?




Any thoughts on the first marketing point of the Lightweight Shockproof?

“Film thickness greater than an SAE 75W140, yet low fluid friction like 80W gear oil or 30W motor oil. “

Anyone try using a GL-5 75w-140 gear oil for their 5MT? Maybe that’s why people get good results with the Lightweight Shockproof oil? The oil stays thicker at operating temperature which allows for more protection for the synchros?
ricardo381 is offline   Reply With Quote
Old 03-05-2019, 11:55 PM   #74
ricardo381
Scooby Newbie
 
Member#: 59615
Join Date: Apr 2004
Chapter/Region: SCIC
Location: Los Angeles, CA, USA
Vehicle:
2013 WRX 5-door
WR Blue Pearl

Default

Quote:
Originally Posted by SubLGT View Post
Have you tried mixing some Redline Lightweight Shockproof with your gear oil?


Drained the Motul and refilled with 3 quarts of Lightweight Shockproof. Feels the best out of all the gear oils I tried so far (Subaru HPGO, Redline 75w-90NS, Motul Gear 300 75w-90, Motul Gearbox 80w-90). Gear shifts are smooth and silent now. Will see how many miles I can get out of it.
ricardo381 is offline   Reply With Quote
Old 03-19-2020, 04:20 PM   #75
millerxcrunning
Scooby Newbie
 
Member#: 512729
Join Date: Mar 2020
Default

Quote:
Originally Posted by ricardo381 View Post
Drained the Motul and refilled with 3 quarts of Lightweight Shockproof. Feels the best out of all the gear oils I tried so far (Subaru HPGO, Redline 75w-90NS, Motul Gear 300 75w-90, Motul Gearbox 80w-90). Gear shifts are smooth and silent now. Will see how many miles I can get out of it.
You did not mix the lightweight shockproof with any motul gear oil? Just straight redline lightweight shockproof?

Thanks in advance!

Last edited by millerxcrunning; 03-19-2020 at 04:49 PM.
millerxcrunning is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 07:28 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.