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90 GL$ Where to buy????

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wbdvt

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Hi,
I have been to several auto part stores looking for 90W GL4 gear oil for the differential on a 80 spit. No one has it and one guy told me that once they upgrade to GL5 they stop making GL4. So where can I buy this???
 
I think that a lot of people here are using a Redline product available at performance stores. I think that it is MT 90.
 
I just got some from Auto Value last week. Here it goes for about $15/gal. Super S brand. They had to order it for me but had it overnight. If you were closer I'd say come get some, they ordered me 5 gal of it in 1 gal bottles. Castrol is supposed to still make it too but I think it's only avail in 5 gal pails.
 
TRF buys the Castrol GL4 and repackages it by the quart (P/N CAGL4). Not cheap, but available.

Redline MT-90 is not supposed to be used in hypoid differentials (the MT stands for Manual Transmission), although I suppose it might work.

My suggestion would be to use Valvoline full synthetic 85W90, which is readily available at parts stores. Even though it is rated GL-5, it does not use the "active sulfur" additive that can damage the yellow metal in Triumph diffs. I ran it in my TR3A for over 150,000 miles, and it not only worked fine but I credit it for helping the axle (which was already well worn when it came to me) live as long as it did (still working fine when the car got wrecked).

Oh, and not that it helps, but Hap's Auto Parts in Long Beach, CA has the Sta-Lube Gl-4 on the shelf :laugh:
 
TR3driver said:
Redline MT-90 is not supposed to be used in hypoid differentials (the MT stands for Manual Transmission), although I suppose it might work.
Click to expand...
Right. It says right on their web site: "MTL, MT-85 & MT-90 are not for use in differentials with hypoid gears." I assume that's because MT-90 is not an EP (extreme pressure) lubricant as required by Standard-Triumph in the differential units.
 
Sorry misread the initial post thought we were discussing trans oil. :shocked:
 
Thanks all. I did try the local NAPA and he is the one who told me that can't get the GL4 since they started making GL5. I think my best bet might be to go with the synthetic as suggested by TR3driver.
 
Well, it depends on the local NAPA. I have one very local to me. In recent years, they've been extraordinarily helpful and gone out of their way to help on oddball old Triumph and Subaru bits. But several years ago, they also were unaware of the existence of GL-4 gear lube. However, a much bigger NAPA store about 8 miles from that other one not only knew what I was looking for but handed me the gallon jug then and there. I'm quite sure that store would do the same again today. (I'm also sure that the staff in my local store has improved greatly and would now be able to get me the GL-4 within a day or so if they don't currently stock it; I've not looked there recently, but then I've got more than enough to tide me over for now!)
 
Andrew Mace said:
Well, it depends on the local NAPA.
Click to expand...
:iagree:
The NAPA name is apparently a franchise, it is up to the local store owner as to what products they stock, and even whether they buy through NAPA or not. One of my local stores carries only Fel-Pro brand repair sleeves, while another one carries (or at least can order) genuine CR Speedi-Sleeves. (The Fel-Pro clones are a few $$ cheaper, but they don't have nearly the range of sizes available, including of course the one I needed.)
 
Closest I could get where I live is a Pennzoil 75W90 synthetic GL4 - it is for Extreme Pressure applications.

jb
 
I just bought a quart of Castrol Hypoy GL-4 from TRF for $10.10. I believe that it is 80W90, although the container does not say and TRF did not know.

Art
 
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