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Old 03-03-2019, 03:19 PM   #1
2bz
 
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Grinding MT 1st gear only

Shifting down to 1st gear has just started to grind. No other gears grind up or down. Did a gear oil change with Mobil 1 75W90 about 6 months ago.

Syncro on 1st going? Clutch dragging? Shift linkage? Something else?

Thanks.
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Old 03-03-2019, 04:53 PM   #2
2bz
 
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Looks like the consensus is synthetic GL-5 lube is shit for Toyota MTs. Going to try swapping it out with some GL-4 Dino.

Last edited by 2bz; 03-03-2019 at 05:43 PM.
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Old 03-04-2019, 02:26 AM   #3
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Just make sure you go for the original Toyota 75W.

I tried Valvoline 75W90 GL4 (replacing the original oil after nearly 200tkm). It was OK but the gearbox started to grind occasionally and the shifting from 1 to 2 in cold weather (-10 Celsius) was hard.

So after a year I changed it to Elf 75W80 (yes, 80 - recommended by Elf) GL4. Cold shifting problem is gone but slight grinding occurs now and then. I would say it is acceptable but next time I would definitely go for Toyota original oil. I have no problem with using non-Toyota liquids for engine oil or coolant or brakes (as long as they match the required specs) but this gearbox seems to be a real gourmet.

Do not make the same mistake as I did and go for original oil directly. It costs a bit more but it is worth it!
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Old 03-04-2019, 08:24 AM   #4
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Mobil 1 synthetic transmission gear oil Yaris first gear grind synchro double clutch

Does this Yaris even have a first gear synchro? Very tight w/ whatever fluid was there when I got the car. Same way w/ Mobil 1 75/90. Wondered why the new Mobil 1 had a faint odor of that rank gear oil smell. Seems like a candidate for counterfeiting.
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Old 03-04-2019, 11:04 AM   #5
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Before I had my clutch type LSD I had good luck with Amsoil MTG, it was smoother than redline MT-90 that untried before it handled the cold really well. It is a proper GL-4 iirc.

The MTG wasn't a good fluid for my LSD so I now use Redline MT-85 and no grinding issues really, and it is a great fluid for a clutch type LSD.

As others stated, stick with a proper GL4 and you should be fine
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Old 03-04-2019, 11:15 AM   #6
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Toyota Yaris manual transmission oil specification

2007 Owner's Manual for USA/Canada specifies API GL-4 or GL-5 w/ viscosity of SAE 75W-90
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Old 03-04-2019, 11:37 AM   #7
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I bought CRC Sta-Lube GL-4 85W90 conventional (dino). Should be able to replace the Mobil 1 within the next few days.

Last edited by 2bz; 03-04-2019 at 12:16 PM.
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Old 03-07-2019, 07:53 AM   #8
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We use this...20190305_071431.jpeg

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Old 03-07-2019, 10:43 AM   #9
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I'm surprised nobody here uses Synchromesh MTF. It's a GL4 and especially good for cold temperature and fuel economy applications, and it's fixed a bad 1-2 grind for me a number of times

https://www.pennzoil.com/en_ca/produ...2NhbGU9ZW5fY2E
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Old 03-07-2019, 12:42 PM   #10
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Quote:
Originally Posted by suprf1y View Post
I'm surprised nobody here uses Synchromesh MTF. It's a GL4 and especially good for cold temperature and fuel economy applications, and it's fixed a bad 1-2 grind for me a number of times

https://www.pennzoil.com/en_ca/produ...2NhbGU9ZW5fY2E
I believe I've used RoyalPurple Synchromax in my transmission after trying Castrol syntec 75W90 and was pretty bad for the transmission.

RoyalPurple was not better, and obviously the wrong type of oil. Drove it a while, then change it to Amsoil GL4.

Transmission has been better since, but I still get the occasional grind shifting into 1st while not 100% stopped. But I'm still grinding shifting from 3rd to 5th when reving high.

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Old 03-08-2019, 10:15 AM   #11
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Quote:
Originally Posted by IllusionX View Post
I believe I've used RoyalPurple Synchromax in my transmission after trying Castrol syntec 75W90 and was pretty bad for the transmission.
How was it bad for the transmission?
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Old 03-08-2019, 10:28 AM   #12
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Originally Posted by suprf1y View Post
How was it bad for the transmission?
RP Synchromax? It's not the right oil for this transmission. It would grind shifting into 1st, and 3 4 and 5th high reving. Just go with proper oil and you shouldn't have problems.



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Old 03-08-2019, 01:19 PM   #13
2bz
 
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Changed to Dino GL-4. No more grinding. Life is good.
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Old 03-08-2019, 02:37 PM   #14
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Or use this.
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Old 03-08-2019, 03:57 PM   #15
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Dino GL-4 for synchromesh

Quote:
Originally Posted by 2bz View Post
Changed to Dino GL-4. No more grinding. Life is good.
Will try to replicate. Why did you opt for the Dino brand of GL-4?

re: 2-1 grind w/ the Mobil 1--was this shift also quite stiff? (Mine takes too much push to happen, but there isn't an audible grind or bite felt in the shift lever.)
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Old 03-08-2019, 05:59 PM   #16
2bz
 
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Quote:
Originally Posted by dogsridewith View Post
Will try to replicate. Why did you opt for the Dino brand of GL-4?

re: 2-1 grind w/ the Mobil 1--was this shift also quite stiff? (Mine takes too much push to happen, but there isn't an audible grind or bite felt in the shift lever.)
Dino as in dinosaur (conventional, not synthetic). It was CRC Sta-Lube gear oil. Yes, on the stiff. But I had grinding on 2>1 and occasionally 2>3. Nice and smooth all around now.
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Old 03-08-2019, 09:48 PM   #17
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and, per your #7 post, 85w90 weight...which sould be a little thicker at low temperatures than the other oils mentioned in this thread.
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