I think the "mistake" was to use an "LS" oil in your synchromesh gearbox. "LS" oils have extreme shear resistance to smooth the operation of clutch-operated Limited Slip differentials. This is the antichrist of synchros, which must cut through the oil film to grab. Use any good quality Non-LS GL-4 oil in your synchromesh gearbox, and keep the LS oil for the Limited Slip diffs it was designed for. 75w80 vs. 75w90 has little to do with the difference you observed, which was due to the friction modifiers present in the LS oil and caused the synchros to slip.
Well said, my car maker's official part store gave me a GL4/GL5 semisynth universal trans oil in place of the old discontinued GL4 only oil a month ago, when i felt a MTF change was needed. It has been shifting like butter ever since, and it has 18 year old synchros that saw the roughness of 70k miles of mostly urban driving. And, sure enough, it isn't a LS oil.
@@teravolt6113 not in a gearbox requiring GL4 my friend. if you're talking diff i'd have zero issue running GL5 in a GL4 application. it will not work in a manual specifying GL4. or at least not in a toyota corolla gearbox specifying GL4.
@@666dynomax As long as it is buffered and has the proper friction modifiers tailored to synchro engagement you're fine my dude. Just check label and data sheet and ensure proper viscosity and ok for synchro manual gearboxes.
I am getting ready to have the manual transmission fluid changed in my 2010 Toyota Yaris with 132,000 mi on it. I was considering using Redline 75w90, but since it gets pretty cold here in PA winters (like 4-5 months out of the year), I will try 75w80 gl4. The manual calls for 75w90 but I read many places that is too thick. I'll report back how it works out for me. Hopefully I don't have to get it changed again shortly afterwards.
@@eluzelu5086 Awesome! Glad to hear someone else who has tried it. I still haven't gotten around to it. I just recently started driving it. Soon hopefully
Any update? Do you still have the car? And which kind of gear oil/MTF viscosity did you stick to? I know Toyota has their own gear oil/MTF that’s 75W, but I’m sure that’s too thin once it warms up, and it might grind. GL-5 75w-90 is the the most common viscosity nowadays, but it’s the extra additives in GL-5 oils that eat away at yellow metal components, such as brass synchronizers.
@@isnowyazn I went with AMSOIL 75W-90 GL4 at around 130,000 mi and again at 160,000 and 190,000 mi around a month ago. My car is still shifting really smooth, no complaints. 75W-90 is what the owners manual called for so that's what I used 2010 Toyota Yaris btw, nit sure if I mentioned it.
Not a problem anymore. Google for ASTM D130 gear oil test. They basically test a copper strip at a really high temp and visually check for how much it tarnishes after a certain time. And keep in mind that synchronizers are made of an alloy, not pure copper. These tests appear to show that tribologists/chemists have come up with a copper-inactive sulfur donor compound that yields GL-5 performance and GL-4 copper compatibility at the same time. Yes, a few GL-5s are so badly formulated that they corrode copper, since the strip gets really badly tarnished during the test. But not all of them.
75w80 API GL4 semi synth is what i put in toyota aygo / citroen c1 / peugeot 107 fitted with 1KR toyota 3 cylinder engines with 5 speed gear box probably similar to your car......1.7 litres is required in these cars for gearbox oil change,never had a problem always nice gear selections .
Is the 75 90 what the hand book specifies for the Yaris only its a straight 75 for an AYGO ? Just curious but is there a reason you didn't use the Toyotas oil?
I also can't find good Gl-4 gearbox oil 75w90, only GL-4/5 or GL-4+ (it's same). And I also had problem with shifting also using same Manol oil and changed after 3-5 thousand km
Hi Buddy, my gear box is notchy and currently on semi-synthetic 75w80(As per manual,). Will moving to 75w90 Amsoil safe and better easy gear shifting???please suggest
@@lukasznowak8873 GL-4 is also specified as Low Sulphur for hypoid gear application since GL-5 and other gear oils with standard sulphur content will destroy the brass synchros. lt does matter.
@@randylee2549 I use ATF oil LA2634 Lifeguard ZF 5 in my manual 5 speed Toyota gearbox for years. It is brilliant, excellent gear selection in cold mornings.
I think the "mistake" was to use an "LS" oil in your synchromesh gearbox. "LS" oils have extreme shear resistance to smooth the operation of clutch-operated Limited Slip differentials. This is the antichrist of synchros, which must cut through the oil film to grab. Use any good quality Non-LS GL-4 oil in your synchromesh gearbox, and keep the LS oil for the Limited Slip diffs it was designed for. 75w80 vs. 75w90 has little to do with the difference you observed, which was due to the friction modifiers present in the LS oil and caused the synchros to slip.
Well said, my car maker's official part store gave me a GL4/GL5 semisynth universal trans oil in place of the old discontinued GL4 only oil a month ago, when i felt a MTF change was needed. It has been shifting like butter ever since, and it has 18 year old synchros that saw the roughness of 70k miles of mostly urban driving. And, sure enough, it isn't a LS oil.
@@teravolt6113 GL4 discontinued??
@@666dynomax More like chemistry got updated to the point there are only benefits to using a GL-5 oil in place of GL-4
@@teravolt6113 not in a gearbox requiring GL4 my friend. if you're talking diff i'd have zero issue running GL5 in a GL4 application. it will not work in a manual specifying GL4. or at least not in a toyota corolla gearbox specifying GL4.
@@666dynomax As long as it is buffered and has the proper friction modifiers tailored to synchro engagement you're fine my dude. Just check label and data sheet and ensure proper viscosity and ok for synchro manual gearboxes.
I put in my Yaris 1.3 vvti 2008, gear oil Mobil Mobilube 1 SHC 75W-90 and it shifts very smoothly. Best brand for Toyota cars !
joesaric1 👌i heard a lot about mobil oil andi will give a try in my 2002 yaris 1.0ltr
@@fizaraja2205 you will find out what grinding noise while changing gear looks like.
My AYGO has a straight 75w. Do you think the Mobil oil is better than Toyotas oil ?
@@gtibruce Give it a try ! Mobil is a good brand also.
Mobil is oem
Manufacturer for toyota
IF MANUFACTURER SAYS THAT WHEN GEARBOX IS HOT OIL SHOULD BE @90 AND YOU BUY 80...DO YOU THINK IT'S GOOD?
I am getting ready to have the manual transmission fluid changed in my 2010 Toyota Yaris with 132,000 mi on it.
I was considering using Redline 75w90, but since it gets pretty cold here in PA winters (like 4-5 months out of the year), I will try 75w80 gl4.
The manual calls for 75w90 but I read many places that is too thick.
I'll report back how it works out for me. Hopefully I don't have to get it changed again shortly afterwards.
@@eluzelu5086 So, I actually didn't get it done yet. My goal is to change it and some other maintenance sometime this upcoming month.
@@eluzelu5086 Awesome! Glad to hear someone else who has tried it. I still haven't gotten around to it. I just recently started driving it. Soon hopefully
Any update? Do you still have the car? And which kind of gear oil/MTF viscosity did you stick to?
I know Toyota has their own gear oil/MTF that’s 75W, but I’m sure that’s too thin once it warms up, and it might grind. GL-5 75w-90 is the the most common viscosity nowadays, but it’s the extra additives in GL-5 oils that eat away at yellow metal components, such as brass synchronizers.
@@isnowyazn I went with AMSOIL 75W-90 GL4
at around 130,000 mi and again at 160,000 and 190,000 mi around a month ago. My car is still shifting really smooth, no complaints.
75W-90 is what the owners manual called for so that's what I used
2010 Toyota Yaris btw, nit sure if I mentioned it.
No way using GL5 instead of GL4. For manual front drive axle only GL4 not even GL4+. GL5 simply killing brass synchronizers.
Not a problem anymore. Google for ASTM D130 gear oil test. They basically test a copper strip at a really high temp and visually check for how much it tarnishes after a certain time. And keep in mind that synchronizers are made of an alloy, not pure copper. These tests appear to show that tribologists/chemists have come up with a copper-inactive sulfur donor compound that yields GL-5 performance and GL-4 copper compatibility at the same time. Yes, a few GL-5s are so badly formulated that they corrode copper, since the strip gets really badly tarnished during the test. But not all of them.
@@teravolt6113wrong
Dont think you should have used the LS 75w90...LS is for limited slip diffs....not so good for synchromesh
75w80 API GL4 semi synth is what i put in toyota aygo / citroen c1 / peugeot 107 fitted with 1KR toyota 3 cylinder engines with 5 speed gear box probably similar to your car......1.7 litres is required in these cars for gearbox oil change,never had a problem always nice gear selections .
Maybe he overfilled it, if u overfill gearbox oil shifting will be awkward.,.
All French cars i have owned had slick gearboxes. I have BMW now, notchy gearbox and experimenting with fluids.
i dont get it, what was the problem you were having with the mannol gl5?? i think it has to be very similar to the GL4+ you installed in the end
Gl5 is not for these gearboxes.
When the oil it hot it stays thick it don't matter when it's cold it's all bout when it heats up
Isn't gl4+ and gl4/gl5 the same thing ?
Hyundai creta Ds o. 75w80. 75w85 80w90
Is the 75 90 what the hand book specifies for the Yaris only its a straight 75 for an AYGO ? Just curious but is there a reason you didn't use the Toyotas oil?
I also can't find good Gl-4 gearbox oil 75w90, only GL-4/5 or GL-4+ (it's same). And I also had problem with shifting also using same Manol oil and changed after 3-5 thousand km
My toyota manual says to use gl4 75w
Can toyota owners use GL5 instead of GL4
@@awaisiqbal8934 use gl-4
So for Mannol GL4 SAE 75W90 is this equal to SAE GL4 toyota ?
How are your expirience whit 75w80 oil after few years ?
replaced it long ago with 75w90 not much of a difference though. that IS my experience wITh it.
And what about 75W ?
Thanks
Gl5 is not acceptable in these manual gearboxes which also means gl4/gl5 is not. You need gl4 such as amsoil or redline MT GL4.
so what your saying is read the manual that came with the car ...
He said it used gl5 that is incorrect. You need gl4.
question s v p
Huile de boite vitesse voiture Hyundai accent GLS année 2003 ???
GL4+ is the same as GL4/GL5
Hi Buddy, my gear box is notchy and currently on semi-synthetic 75w80(As per manual,). Will moving to 75w90 Amsoil safe and better easy gear shifting???please suggest
NEVER EVER.. USE API "GL-5 or GL-4/GL-5" in Manual Transmission..
Only use API GL-4
Hyundai creta 1.4 gear oil Ds o
Hyundai creta 1.4 Diesel the gear Oil great DS o
@0:30 LS = LOW SULPHUR
No mate it mean oil for limited slip differential u confused gearbox oil with engine oil bro lol
@@lukasznowak8873 GL-4 is also specified as Low Sulphur for hypoid gear application since GL-5 and other gear oils with standard sulphur content will destroy the brass synchros. lt does matter.
Try ATF oil, excellent in manual Toyota gearboxes.
75W90 gear oil only Sir. be real.
@@randylee2549 I use ATF oil LA2634 Lifeguard ZF 5 in my manual 5 speed Toyota gearbox for years. It is brilliant, excellent gear selection in cold mornings.