2003 Tacoma: 80W-90 for Diff AND Transmission?

(Scott Dorsey) wrote in news:ic1s0j$pen$1
@panix2.panix.com:

> Tegger > wrote:
>>
>>Your diff *MUST* use hypoid lubricant.
>
> This makes sense since it needs that high pressure additive.
>
>>Your transmission *MUST NOT* use hypoid lubricant.
>
> Why not? Why does the high pressure stuff do any harm? There aren't
> any bronze bushings or anything, right?



Synchros. Hypoid lubricants mess with their frictional properties. You can
get grinding and difficulty getting the lever into gear.


--
Tegger

On 17 Nov 2010 21:26:21 -0500, Scott Dorsey wrote:

> hls > wrote:
>>>
>>> Why not? Why does the high pressure stuff do any harm? There aren't
>>> any bronze bushings or anything, right?
>>
>>Those EP lubricants, usually based on sulfur compounds, are as slick as owl
>>snot.
>>I dont think auto trannies are made with these in mind. Mechanical
>>gearboxes might
>>thrive on them.. Just my $.02 of uneducated comment.
>
> Yeah, I thought we were talking only mechanical gearboxes, not the
> slushboxes. I don't see any reason why the EP additives would be bad
> in a manual unless it did have bronze bushings for synchronizers or
> the like... and if it did, they would be eaten away pretty fast...
> --scott

Mitsubishi manual transmissions spec hypoid gear oil and contain bronze
looking syncro cones.

Bret > wrote in
:


>
> Mitsubishi manual transmissions spec hypoid gear oil and contain
> bronze looking syncro cones.
>


Then the synchros are designed for use with hypoid, which is not common
practice, from what (I think) I know.

In any case, the OP's gearbox was not designed for use with hypoid, while
his diff was, so whatever Mitsu does is not relevant to what the OP's
Toyota needs.


--
Tegger

On Thu, 18 Nov 2010 02:53:24 +0000 (UTC), Tegger wrote:

> Bret > wrote in
> :
>
>
>>
>> Mitsubishi manual transmissions spec hypoid gear oil and contain
>> bronze looking syncro cones.
>>
>
>
> Then the synchros are designed for use with hypoid, which is not common
> practice, from what (I think) I know.
>
> In any case, the OP's gearbox was not designed for use with hypoid, while
> his diff was, so whatever Mitsu does is not relevant to what the OP's
> Toyota needs.

Absolutely.

On Wed, 17 Nov 2010 11:40:14 -0800 (PST), Josh wrote:

> The owners manual for my 2WD recommends SAE 75W-90 for the 5-speed

This says for an 03 Tacoma API GL-4 or GL-5
http://www.tankota.net/repair/Repair...mtw59/lubr.pdf

> For the differential it recommends Hypoid Gear Oil API GL-5 in either
> SAE 90 (above 0 degrees F.), or SAE 80W or 80W-90 below zero.
>
> I live in West Texas where the winters are mild and the summers hot.
> Do you see any problem with using Quaker State 80W-90 GL-5 High
> Performance Gear Lubricant (non-synthetic) for both the trans AND the
> diff? The Quaker State label says it's suitable in applications
> specifying API GL-5.

Seems to be allowed, does the manual say API GL-5 is ok in the
transmission.

> Just wondering how critical the weights are and whether using 80W-90
> instead of 75W-90 constitutes a major change in lubricant
> performance.

IMHO no.

> In any case, the OP's gearbox was not designed for use with hypoid, while
> his diff was, so whatever Mitsu does is not relevant to what the OP's
> Toyota needs.


OP here.

It looks like the consensus of you guys is that the Quaker State
80W-90 GL-5 will be fine for the diff.

As for the trans, I forgot to mention my manual recommends:

OIL TYPE: Gear Oil API GL-4 or
GL-5, Viscosity 75W-90

The Quaker State 80W-90 GL-5 bottle label says "It is suitable for
make-up or refill fluid in those applications specifying an API,
GL-5 , Mt-1 gear lubricant such as manual transmission and
conventional and Ltd slip differentials". It also says it provides
extreme protection for hyphoid gears.

Since the oil already in my trans is API GL-4 or 5, and Quaker State
says this stuff is suitable for refilling transmissions specifying
API, GL-5 lubricant, it looks like the QS is OK for my trans. But I'm
still not clear as to whether this QS 80W-90 is technically a HYPHOID
lubricant, or just one that will work with hyphoid gears.

"Scott Dorsey" > wrote in message > Yeah, I thought we were
talking only mechanical gearboxes, not the
> slushboxes. I don't see any reason why the EP additives would be bad
> in a manual unless it did have bronze bushings for synchronizers or
> the like... and if it did, they would be eaten away pretty fast...
> --scott

He said it was a 5 speed, but at first I assumed it could be automatic.
I dont even know if they have an auto 5speed for that vehicle.
But like you, if it were a manual, it probably wouldnt be much of a
problem.
That is what I get for assuming.

Josh > wrote in
:

>> In any case, the OP's gearbox was not designed for use with hypoid,
>> while his diff was, so whatever Mitsu does is not relevant to what
>> the OP's Toyota needs.
>
>
> OP here.
>
> It looks like the consensus of you guys is that the Quaker State
> 80W-90 GL-5 will be fine for the diff.
>
> As for the trans, I forgot to mention my manual recommends:
>
> OIL TYPE: Gear Oil API GL-4 or
> GL-5, Viscosity 75W-90
>
> The Quaker State 80W-90 GL-5 bottle label says "It is suitable for
> make-up or refill fluid in those applications specifying an API,
> GL-5 , Mt-1 gear lubricant such as manual transmission and
> conventional and Ltd slip differentials". It also says it provides
> extreme protection for hyphoid gears.
>
> Since the oil already in my trans is API GL-4 or 5, and Quaker State
> says this stuff is suitable for refilling transmissions specifying
> API, GL-5 lubricant, it looks like the QS is OK for my trans. But I'm
> still not clear as to whether this QS 80W-90 is technically a HYPHOID
> lubricant, or just one that will work with hyphoid gears.
>
>


I just checked with a Toyota MDT Tech I know. Apparently I'm wrong: That
lube will in fact be just fine for use in both your tranny and your diff.
He says they've been using GL-5 for years with no problems.

The only real hitch is that in cold weather you may find shifting to be a
bit stiff, and in that case you just warm the engine up a bit to allow its
heat to soak into the tranny before driving off.




--
Tegger

jim beam > wrote:
>
>ep additives wouldn't "eat" them away - it would lubricate the cone
>clutches [in that kind of] synchro so they didn't clutch properly. if
>they don't clutch, then the gear meshing dogs grind.

Could be. Thing is, the EP additives are sulfur compounds that form sulfur
complexes on the surface of steel. This is a kind of corrosion, but it's a
kind of corrosion that prevents galling and greatly improves lubrication
performance at high pressures.

Unfortunately those additives will cause uncontrolled corrosion on some
copper alloys. I have seen film projector gearboxes where people replaced
the turbine oil with similar viscosity gear oil, and it literally dissolved
brass and bronze parts.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

(Scott Dorsey) wrote in
:

> jim beam > wrote:
>>
>>ep additives wouldn't "eat" them away - it would lubricate the cone
>>clutches [in that kind of] synchro so they didn't clutch properly. if
>>they don't clutch, then the gear meshing dogs grind.
>
> Could be. Thing is, the EP additives are sulfur compounds that form
> sulfur complexes on the surface of steel. This is a kind of
> corrosion, but it's a kind of corrosion that prevents galling and
> greatly improves lubrication performance at high pressures.
>
> Unfortunately those additives will cause uncontrolled corrosion on
> some copper alloys. I have seen film projector gearboxes where people
> replaced the turbine oil with similar viscosity gear oil, and it
> literally dissolved brass and bronze parts.




In the case of the OP, a Toyota MDT Tech told me the OP's chosen GL-5 oil
will do just fine in both tranny and diff. He might encounter slightly-
stiff shifting in cold weather, but that's not a big deal.


--
Tegger