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That new manual transmission fluid feeling #5258780 11/04/19 11:21 PM
Joined: May 2013
Posts: 62
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2000Trooper Offline OP
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I have a manual transmission Tacoma with the r156f transmission. Seems like a lot of people with this transmission and the previous generation 155f(2005-2015 models) complain about 2nd gear and 3rd gear engagement being best described as notchy. So far I've tried redline mt-90, motul 300v and currently on liquimoly 75w90 gf-4 fluid. Anytime I change the fluid the transmission shifts sooo smooth and beautifully that I don't want to stop driving. After a couple hundred miles, which I'm assuming is once the oil breaks in, that beautifulness disappears and I'm back to the notchy shifts. Any ideas why this happens and is there a way of addressing it?

Re: That new manual transmission fluid feeling [Re: 2000Trooper] #5258782 11/04/19 11:28 PM
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AC1DD Offline
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I believe the Motul 300v and Liqui-Moly are both GL-5 especially the LM because they do not sell a 75w-90 GL-4 in the US market.

Why not try a 75w GL-4? NOT a synchromesh variety...but a REAL 75w GL-4 only gear oil?

Re: That new manual transmission fluid feeling [Re: AC1DD] #5258819 11/05/19 01:15 AM
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2000Trooper Offline OP
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Originally Posted by AC1DD
I believe the Motul 300v and Liqui-Moly are both GL-5 especially the LM because they do not sell a 75w-90 GL-4 in the US market.

Why not try a 75w GL-4? NOT a synchromesh variety...but a REAL 75w GL-4 only gear oil?


I'm personally one of those guys who believes heavier oils protect better, I forget the exact term people label us on here, but yeah I'm one of THOSE guys grin

Anyways, OEM specs 75w90, and I don't see my self going lower unless it will actually be beneficial other than just gaining a fraction of a MPG. I doubled checked, both LM and Motul do make GL-4 variants. Correction: the motul was a gear 300, not a 300V. One of the reasons I actually tried the LM was because it's not a full synthetic. As GL5 is too slippery for transmissions I thought maybe the synthetic GL4 oils I was trying were maybe too slippery causing the undesirable shifting characteristics. The LM product I got is supposed to be a semi-synthetic(however way they're defining it) and it was a let down too. Atleast at $10 a quart I dont feel terrible with my experiment.

Last edited by 2000Trooper; 11/05/19 01:16 AM.
Re: That new manual transmission fluid feeling [Re: 2000Trooper] #5258821 11/05/19 01:37 AM
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double vanos Offline
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Try Motorcraft Xt-M5 QS. Wonder fluid.


Sabine Schmitz is the Queen of the 'Ring; Svetlana Kapanina is the Queen of the SKIES...
Re: That new manual transmission fluid feeling [Re: AC1DD] #5258888 11/05/19 06:42 AM
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nwjones18 Offline
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Originally Posted by AC1DD
I believe the Motul 300v and Liqui-Moly are both GL-5 especially the LM because they do not sell a 75w-90 GL-4 in the US market.

Why not try a 75w GL-4? NOT a synchromesh variety...but a REAL 75w GL-4 only gear oil?


Redline is a REAL GL-4 only gear oil isn't it?

https://www.redlineoil.com/mt-90-75w90-gl-4-gear-oil

Honestly if none of those fluids has addressed the feeling your having nothing is going to IMO. I can't explain the 'feeling great for a while' symptom though.. haha


2016 Ram 1500 5.7 Hemi 30k QSUD 5w-20 and Mopar filter
1988 F-150. 4.9 I6 251k. 10w-40 QSHM Motorcraft FL1A
2007 Mazda 3 2.3 130k 5w-30 syn-blend and Denso filter
Re: That new manual transmission fluid feeling [Re: 2000Trooper] #5258893 11/05/19 06:53 AM
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aquariuscsm Offline
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Originally Posted by 2000Trooper
I'm personally one of those guys who believes heavier oils protect better, I forget the exact term people label us on here, but yeah I'm one of THOSE guys grin


I'm one of those too. We're "thickies" haha! laugh


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Quaker State Advanced Durability 10W30

Re: That new manual transmission fluid feeling [Re: 2000Trooper] #5260971 11/07/19 03:59 PM
Joined: Mar 2017
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zaffo757 Offline
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My 2004 Honda S2000 has a finicky 6 speed that liked to grind going into 2nd. Royal Purple Syncromax tamed it.

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