Diff Oil? - Alfa Romeo Bulletin Board & Forums
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post #1 of 18 (permalink) Old 08-31-2018, 06:56 AM Thread Starter
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Diff Oil?

Simple question. I have a 1982 Spider, and I have NO documentation or manuals. I want to check the diff fluids, but do not know that is in there. Anyone tell me? How difficult is it to remove the filler/check plug?

Art
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post #2 of 18 (permalink) Old 08-31-2018, 07:38 AM
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No way to know what is in there now (unless the Previous Owner left you some service records). What should be in there is standard gear oil - 75-90 weight.

The fill plug will likely need a 12mm hex key (like a big allen wrench). But check yours first - you never know what a PO might have done...

And, even though you didn't ask, the transmission takes a special gear oil. RedLine 75-90NS works well. Most other gear oils are too 'slippery' and the synchros won't work right. And, be sure you can remove the fill plug before draining either the differential or the gearbox.
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- - Eric
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~ 1984 Spider Veloce ~
- -~ 1981 GTV-6 ~
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post #3 of 18 (permalink) Old 08-31-2018, 08:07 AM Thread Starter
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Thanks, I have the 12 mm hex socket to take the filler plug out, but wanted to know what should be in there before I check. Also good information on the Transmission. I have only had the car a month and I'm working my way through it checking things. It works well, but I am slowly checking most components before I do any distance in it. Appreciate your quick response. Wish I could find a service manual for this year; they seem almost impossible to find.

Art
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post #4 of 18 (permalink) Old 08-31-2018, 08:42 AM
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I bought a CD/DVD from Car Disc. CarDisc International Ltd. - Alfa Romeo Manuals It has copies of all the shop manuals, owners manuals, TSB, even some period advertising.

You can also contact the Librarian* of the AROC-USA. They have copies for a nominal fee. Alfa Romeo Owners Club USA

* He also posts here as 'Papajam'. You should send him a PM (Private Message) and request copies of his color coded wire diagrams for your model/year Alfa. Include your email address - he'll send some .pdf files that will make sorting electrical issues a lot easier. I took my copies (on a flash drive) to an office supply store and had them print out 11" x 17" color copies then plastic laminate them. Perfect for use in the garage!

- - Eric
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post #5 of 18 (permalink) Old 08-31-2018, 07:56 PM Thread Starter
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Thanks, I already requested a copy of wiring diagrams and did exactly as you suggested and enlarged colour printed it and them had it laminated; makes it easier to track down electrical issues.

I also took your advice and ordered a DVD workshop manual - that should help my tinkering and repairing.
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post #6 of 18 (permalink) Old 09-01-2018, 10:41 PM
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a lsd axle should have special oil for that.
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post #7 of 18 (permalink) Old 10-24-2018, 05:44 AM Thread Starter
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LSD?

I watched an episode of Wheeler Dealers where they restored a Spider, and they did work on the differential as part of the work. They said a LSD differential can be identified by a special "V" casting on the front of the unit. I was working on my 82 Spider with it on a hoist and mine seems to have that "V" casting mark. How do you know if you have an LSD? It was mentioned that if a car has a Limited Slip Differential it needs special oil. Anyone help with this question. I looked through the DVD workshop manual and this is not covered and the pictures there have the "V" casting.

Art

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post #8 of 18 (permalink) Old 10-24-2018, 06:30 AM
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I am pretty sure that all of the 2L cars sold in North America had LSD's. Also, ignore the advice on WD about adding the extra plates in the LSD clutch. That is a racing modification that can get you into trouble on a slippery surface. I just replaced the oil in my diff and I used Redline 75W90NS, the same oil that I use in the gearbox.

Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #9 of 18 (permalink) Old 10-24-2018, 06:30 AM
Richard Jemison
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Lubricants

Both the LSD unit and the syncronizers require the correct lubricant. It IS Redline 75-90 NS
It is available at Centerlinealfa.com.

DON`T use anything else, particularly the ones suggested in the manual.

There is many post on this subject in the BB. Do a search!

Richard Jemison
RJR Racing

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post #10 of 18 (permalink) Old 11-04-2018, 02:17 AM
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Quote:
Originally Posted by Alfar7 View Post
Both the LSD unit and the syncronizers require the correct lubricant. It IS Redline 75-90 NS
It is available at Centerlinealfa.com.

DON`T use anything else, particularly the ones suggested in the manual.

There is many post on this subject in the BB. Do a search!
Does't the NS denote non limited diff?

https://www.opieoils.co.uk/p-1016-re...5w-90-gl5.aspx

https://www.opieoils.co.uk/p-1017-re...ited-slip.aspx

Thanks to anyone clarifying this?
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post #11 of 18 (permalink) Old 11-04-2018, 04:52 AM
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Quote:
Originally Posted by Alfanut1750 View Post
Does't the NS denote non limited diff?

https://www.opieoils.co.uk/p-1016-re...5w-90-gl5.aspx

https://www.opieoils.co.uk/p-1017-re...ited-slip.aspx

Thanks to anyone clarifying this?

It is my recollection the NS version belongs in the transmission and the straight version belongs in the differential. I will be changing soon so a clarification would be helpful.

thanks to all
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post #12 of 18 (permalink) Old 11-04-2018, 04:55 AM
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The description from the website you reference is wrong. Straight from Redline: https://www.redlineoil.com/75w90-ns-gl-5-gear-oil.

Rich Hanning
'65 Sprint GT, '78 Spider, '88 Quad

Last edited by 65Sprint; 11-04-2018 at 09:05 AM. Reason: Fix the url.
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post #13 of 18 (permalink) Old 11-04-2018, 05:07 AM
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Quote:
Does't the NS denote non limited diff?
It means the exact opposite. It is for clutch type LSD's.

Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #14 of 18 (permalink) Old 11-04-2018, 07:19 AM
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The 75W90 has the LSD additives for clutch-type LSDs and the 75W90NS does not. This is all on the Redline pages and tech articles, yet folks seem to keep getting it wrong.

https://www.redlineoil.com/Content/f...ech%20Info.pdf

https://www.redlineoil.com/75w90-gl-5-gear-oil
"Contains additional friction modifiers for suitability with clutch-type limited slip differentials - for most LSDs, no additional friction modifiers are required"

Tom

1963 Giulia Spider (1750 engine)
1974 GTV
1991 Spider
Former: 1987 Milano Gold
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post #15 of 18 (permalink) Old 11-04-2018, 09:47 AM
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So, is it safe for us non tech, but want the correct product, the Redline 75W90NS GL5 is the lube for both the transmission and the differential?

thanks to all
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