What do you suggest for a daily driver that asks for a GL5 in a 5spd transmission? I want to use a dino oil in this vehicle.
Dino GL5 Suggestions for Transmission
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Supertech 80W90 is less than $8 gallon I think...
MolaKule
Staff member
There are a lot of daily drivers out there and crsytal balls are becoming expensive due to the rising price of crude.
What type of vehicle and what viscosity is specified? Auto transmission or I assume, a Manual Transmission?
Don't use a DIFFERENTIAL lube in a Manual Transmission; two different formulations.
What type of vehicle and what viscosity is specified? Auto transmission or I assume, a Manual Transmission?
Don't use a DIFFERENTIAL lube in a Manual Transmission; two different formulations.
It is a manual transmission in a 87 Toyota truck and it ask for a GL5 80-90. I was looking at what was available locally and found the dino gear lubes they had say they work in both diffs and transmissions, nothing specific to either. What dino oils are available that are transmission specific? I don't want to use a synthetic in this vehicle.
MolaKule
Staff member
I am not aware of any non-dino MT 75W90's.
Try this:
Take your Coastal dino differential fluid or whatever and use 25% by volume of Pennzoil Synchromesh to 75% by volume of your dino juice.
The problem is, final costs equal a good Synthetic.
Try this:
Take your Coastal dino differential fluid or whatever and use 25% by volume of Pennzoil Synchromesh to 75% by volume of your dino juice.
The problem is, final costs equal a good Synthetic.
I have my reasons for not wanting a syn in this vehicle. Didn't want to get into debate. Its not a matter of cost.
Where do I get Pennzoil synchromesh?
Where do I get Pennzoil synchromesh?
does Castrol have Multitrax there ?
This is a GL5, 75W-90 manual trans/hypoid transaxle lube. Used to use it in the wifes old GQ Nissan Patrol g/box, or for the front diff in part time 4WD applications where the front hubs may be (accidentally) left in during winter.
I'd hate to see how much of it is VII to get the 75W-90.
PS, it's a full dino, confirmed with Castrol
This is a GL5, 75W-90 manual trans/hypoid transaxle lube. Used to use it in the wifes old GQ Nissan Patrol g/box, or for the front diff in part time 4WD applications where the front hubs may be (accidentally) left in during winter.
I'd hate to see how much of it is VII to get the 75W-90.
PS, it's a full dino, confirmed with Castrol
MolaKule
Staff member
At Wallyworld, Autozone, etc, etc.
Mola,
Toyota has been recommending the usage of 80W90; GL-5 rated gear lube in their manual transmissions for many years. To this day, they have yet to withdraw their recommendation due to shifting problems.
While I don’t disagree with you that manual transmission specific lubricants of the correct viscosity are superior to gear lubes, gear lubes are suitable for use in manual transmissions that allow the usage of a GL-5 80W90. It certainly isn’t ideal, and I doubt any damage will be caused unless there are shifting problems.
Toyota has been recommending the usage of 80W90; GL-5 rated gear lube in their manual transmissions for many years. To this day, they have yet to withdraw their recommendation due to shifting problems.
While I don’t disagree with you that manual transmission specific lubricants of the correct viscosity are superior to gear lubes, gear lubes are suitable for use in manual transmissions that allow the usage of a GL-5 80W90. It certainly isn’t ideal, and I doubt any damage will be caused unless there are shifting problems.
fwiw.. i've had many toyota trucks 2wd/4wd/4Runners.. you can use a "diff/trans" rated 80/90 but i would really try to sway you away after i caused problems with my first 85 truck in the early 90's. I changed to a valvoline 80/90 and i believe it caused rapid synch wear and very tough shifting in just a few weeks. I found the proper gl4 75/90 from the dealer and swapped back and it was better but never the same and i learned to live with it. i later swapped a 95 tacoma to m1 75/90 and it felt worse. I swapped it back and all was normal. i should have learned the first time. anyway, since then i only use the proper rated fluid from either the dealer or most recently Molakule/specformulations or never changed the fluid.. even junkyard 5spd's are $$$$.. read some of the toy forums and see what the other are using. i know that the others have had poor results from gl5 80/90 lubes also synth and dino. my newer tacoma is 75/90 gl4 or gl5 recommended also as were the old 4/5 speeds. just because its rated doesnt mean it will work flawlessly in your application. mola has good advise and some really good info in regards to mtf's in this section and the white papers. try his mix and see how it does.
..mudd
..mudd
MolaKule
Staff member
Could it be that the reason Toyota has been recommending a differential lube may be due to certain factors such as:
1. MT specific fluids (other than Synchromesh)weren't originally available in the weight needed by Toyota
2. Engineers are not tribologists or lubrication engineers,
3. they are trying to save the customer and dealer from having to stock MT specific fluids at the cost of increased transmission wear?
1. MT specific fluids (other than Synchromesh)weren't originally available in the weight needed by Toyota
2. Engineers are not tribologists or lubrication engineers,
3. they are trying to save the customer and dealer from having to stock MT specific fluids at the cost of increased transmission wear?
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