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Old 07-23-2018, 11:26 PM   #51
ricardo381
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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?
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Old 07-24-2018, 12:36 PM   #52
scoobydooluth
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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.
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Old 07-24-2018, 04:36 PM   #53
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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.
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Old 07-24-2018, 10:43 PM   #54
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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!
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Old 07-24-2018, 11:20 PM   #55
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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.
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Old 07-25-2018, 12:21 AM   #56
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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.
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Old 07-25-2018, 02:45 AM   #57
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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.
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Old 07-25-2018, 08:32 AM   #58
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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, 🤷🏽*♂️ sorry I guess, but dont the six speeds work with pretty much anything.
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Old 08-02-2018, 12:52 AM   #59
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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.
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Old 12-24-2018, 01:45 PM   #60
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I will actually do this. Thank you.
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Old 01-04-2019, 09:32 AM   #61
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Motul's Gear 300 75w90 is magic. Wonderful stuff. I ran it in my BRZ's 6MT and never had trouble shifting.
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Old 01-10-2019, 11:09 PM   #62
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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.
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Old 01-15-2019, 07:45 AM   #63
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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?
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Old 01-15-2019, 09:36 AM   #64
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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.
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Old 01-21-2019, 08:33 PM   #65
ricardo381
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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?

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Old 01-21-2019, 09:03 PM   #66
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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.
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Old 01-24-2019, 01:06 AM   #67
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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?
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Old 01-24-2019, 11:38 PM   #68
ricardo381
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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...
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Old 01-25-2019, 01:04 PM   #69
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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...
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Old 01-25-2019, 07:57 PM   #70
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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.
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Old 01-26-2019, 12:21 AM   #71
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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.
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Old 01-27-2019, 07:54 PM   #72
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Old 01-28-2019, 01:36 AM   #73
ricardo381
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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?
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