03-14-2007, 03:20 AM
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Registered User
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Join Date: Jan 2007
Location: Rødekro, Denmark, northern part of Europe
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Shell Spirax diff oil for a 1966 GTJ
Hello All !
I am about to change the diff oil, and is searching for the right Shell Spirax 90EP as listed in my OWM. Unfortunately this oil doesent exist any more, but many other Spirax is available, see picture. But which one is the correct type ? When you ask Shell in Denmark, no direct replacement is available, they recommend Shell Transaxle oil 75W/90.
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Morten Svendsen, Rødekro, Denmark
Alfa Romeo 1300 GT Junior 1966[/FONT]
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03-14-2007, 04:07 PM
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I do have the same problem, with the new Shells. They dont have -as they say- a direct substitute of the old Spirax.
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03-16-2007, 03:06 AM
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Hello All !
According to Shell Denmark, Spirax GX 80W or GX80W-90 should be the correct replacement. It is a GL4-oil like Spirax 90 EP was.
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Morten Svendsen, Rødekro, Denmark
Alfa Romeo 1300 GT Junior 1966[/FONT]
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03-17-2007, 09:31 AM
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Richard Jemison
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Join Date: Apr 2005
Location: Pensacola, Fl. U.S.A.
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Gear lube for 1966 GTV
For your car and any non LSD differential any good 75-90 weight gear lube will do nicely. In fact if it getting a bit noisy the 90-140 weight GL5 gear lubes might quiten it down, but you probably dont need that in a cold climate.
BUT CAUTION! In the transmission NEVER use any GL5 lube. Only GL3 or GL4. That goes for Differentials and Transaxles with LSD as well!
Richard Jemison
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03-17-2007, 03:49 PM
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Hello !
Just figured out the current gearbox oil on my gearbox is a GL5-type ! Its a Castrol type and was recommended by Castrol. Bad....
The transmission oil will be changed after this information, the car has only covered around 1000 km with this oil. What damage does a GL5-oil cause ? I havent noticed any change when shifting and no change in noise.
What is the difference between a GL4 and GL5 oil ?
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[FONT="Comic Sans MS"]Best Regards
Morten Svendsen, Rødekro, Denmark
Alfa Romeo 1300 GT Junior 1966[/FONT]
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03-18-2007, 09:49 AM
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Richard Jemison
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Location: Pensacola, Fl. U.S.A.
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GL5 / GL3 or 4 Lubes
The EP additives in GL5 and Hypoid friction modifiers make the lube so Slipery and resistant to shear that the syncronizers, which depend on friction to spin up the gear train when shifting can`t get a good grip. Eventually the teeth points will be gone. 
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03-19-2007, 12:31 AM
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Oh... !
What about changing the oil a few times to the correct type ? Or can I flush the gearbox with something ?
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[FONT="Comic Sans MS"]Best Regards
Morten Svendsen, Rødekro, Denmark
Alfa Romeo 1300 GT Junior 1966[/FONT]
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03-19-2007, 06:58 AM
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Richard Jemison
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Flushing Gearbox
I reccommend that you do that. After draining, fill with mineral spirits, or kerosene. Run (not drive) & Shift through gears several times. Stop engine for few minutes for fluids to drain out of syncros, it is slow process. Do this two or three times then drain. Fill with correct fluid.
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Richard Jemison
RJR Racing
http://scuderiagiallo.com
"you don`t have to listen, but you won`t win the argument"!
"Nothing that I might suggest will be legal in California"
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03-19-2007, 10:54 AM
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ReAlfisted 3/06
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 Quote:
Originally Posted by Bertonemorten
What is the difference between a GL4 and GL5 oil ?
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John R. Young & Company, Inc.
(800) 481-3889 or (215) 234-4593
Fax: (215) 234-0341
www.johnryoungco.com
GL5 stuff was developed (I think for the most part) for modern day rear axles and compatability should be made certain if used in gearboxes or transaxles. GL5 shouldn't be used in Chevy Muncie 4 speeds either - only GL4 stuff should be used and IMO it should't be synthetic.
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1973 GTV - bought 3/06
1969 GTV, #AR1530021 - sold 10/72
Last edited by lowmileage; 03-19-2007 at 02:15 PM.
Reason: had "should be" synthetic instead of shouldn't be, IMO
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03-20-2007, 02:01 AM
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Actually, it is possible to get GL4 at our local spare parts store - fex castrol SMX-S which is also used in the gearbox of my FIAT Punto...
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[FONT="Comic Sans MS"]Best Regards
Morten Svendsen, Rødekro, Denmark
Alfa Romeo 1300 GT Junior 1966[/FONT]
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03-20-2007, 08:40 AM
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Hello !
A cheaper alternative would be a Redline MT90, does anyone have experience with this oil ? It has the correct GL4-rating, and a viscosity of 15,6 cSt at 100°C, close to the correct 16 cSt in 90 EP. I Am planning to use it in transmission and gearbox. The price is €15.3/L.
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[FONT="Comic Sans MS"]Best Regards
Morten Svendsen, Rødekro, Denmark
Alfa Romeo 1300 GT Junior 1966[/FONT]
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03-20-2007, 09:18 AM
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ReAlfisted 3/06
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Quote:
Originally Posted by Bertonemorten
Hello !
A cheaper alternative would be a Redline MT90, does anyone have experience with this oil ? It has the correct GL4-rating, and a viscosity of 15,6 cSt at 100°C, close to the correct 16 cSt in 90 EP. I Am planning to use it in transmission and gearbox. The price is €15.3/L.
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I use it in the transaxle of my daily driver (non Alfa ) which requires a GL4. I do believe it has contributed to a leak from the axle seal which I subsequently replaced and that eventially leaks also. What I am doing now is adding Penzoil GL4 dino gear lube as a replacement in a "test" to see if the leak stops. What I won't do is continually add $8-$9/qt MT90 in and have it leak out. IMO, based on my results with a modern vehicle, I wouldn't use syn in an old (certainly pre 1980 something) Alfa.
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1973 GTV - bought 3/06
1969 GTV, #AR1530021 - sold 10/72
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03-20-2007, 03:25 PM
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as far as I know the rear did not change other then LSD in some.
so I would say use the oil Alfa used in the newer cars with out LSD.
Red Line 75W90NS
or
Shell Spirax Gear Oil 80W/90HD Extreme Pressure
I have used both with the LSD with out any problems.
the above oil will work in the trany too if you have the moly syncros.
the oils improved over time. and the multi-grade gives you better oiling when cold.
I just switched to the redline in my Verde and it seem better then the Spirax.
For Redline the NS is a must for the trany. but I do not think it would matter etherway for NON-LSD diff.
The NON-NS has the friction modifiers so it might be even better for the diff. but would be very bad for the trany.
with LSD I would still use the NS unless I had chatter then I would only add a small amount of the NON-NS untill it stoped chattering. or just add the friction modifiers that comes in a tube untill the chattering stops. that way I have the min friction modifiers needed so the clutches in the LSD can get the most bite.
in a NON-LSD I think the friction modifiers would just make things last longer. as there is no cluth in there.
thats my $0.02
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1987 black Milano Verde
1972 White spider 2000 Veloce
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03-20-2007, 08:56 PM
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Richard Jemison
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Redline NS
Quote:
with LSD I would still use the NS unless I had chatter then I would only add a small amount of the NON-NS untill it stoped chattering. or just add the friction modifiers that comes in a tube untill the chattering stops. that way I have the min friction modifiers needed so the clutches in the LSD can get the most bite.
in a NON-LSD I think the friction modifiers would just make things last longer. as there is no cluth in there.
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The Redline 75-90NS & it`s heavier blend both have the LSD friction modifiers IN THEM. It` is a great choice for any Alfa transmission or differential, and the only lube I reccommend for the racing transaxles we build. If you have chattering with NS it`s time to rebuild the LSD unit. The Limited Slip additive really reduces friction very little, but a LSD that is set up "loose" actually puts more clamping pressure on the clutches.
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Richard Jemison
RJR Racing
http://scuderiagiallo.com
"you don`t have to listen, but you won`t win the argument"!
"Nothing that I might suggest will be legal in California"
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03-20-2007, 10:09 PM
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But Mad North-Northwest
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Location: SF Bay Area, CA
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I'm afraid you have it backwards there, Richard. The NS stuff is without the limited slip additive, and is what should go in the tranny if you use Redline in a later Alfa which specs GL-5.
NS will work in the LSD, too, but might chatter depending how worn your plates are or not.
http://www.redlineoil.com/pdf/5.pdf
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Tom
1991 Spider
1987 Milano Gold
Last edited by Gubi; 03-21-2007 at 12:57 AM.
Reason: typo
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