What is it with this GL-5 gear oil?? - Page 8 - Alfa Romeo Bulletin Board & Forums
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post #106 of 116 (permalink) Old 12-23-2016, 05:58 PM
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Well, I guess that answers that question, sorry. At least it's nothing irreversible. Some folks flush the transmission with kerosene to get the old stuff out: no idea if that's a good idea or not.

You may want to search to see what other folks are using. The Napa stuff is a true GL1 oil and should be a direct Dentax 90 replacement. The Redline MT-90 is a GL4 but they say it's suitable for GL1 applications.

https://www.napaonline.com/napa/en/p/FCA65201/FCA65201

Tom

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post #107 of 116 (permalink) Old 12-24-2016, 05:08 AM
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I see my local NAPA has the one gallon container of 90W GL-1 in stock.

I will report back after the switch. I hope its a quality product, as I want this old girl to be happy and healthy.

Thanks

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post #108 of 116 (permalink) Old 12-26-2016, 12:21 PM
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Ah, I thought you were talking about the '76. Does the '66 have the old style synchronizer rings? I forget when the cutoff was. If so, it uses a different gear oil spec.

Look in the manual: does it spec Spirax or Dentax for the gearbox?
Looks like that serial number or production date cutoff would be helpful for others with early cars. I now have the GL-1 in the gearbox, and everything seems to be returning to normal. Sure hated to see all that new Redline 75W/90 NS dumped into the 'used oil' drum after just a couple of days.....and double the labor cost.

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post #109 of 116 (permalink) Old 01-23-2017, 11:08 PM
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She'll spiral s4 ax 80w-90 anyone know if this is non slip for a 74 gtv transmission. The transmission has been totally refreshed by the looks of it. Here is the brochure

http://www.shell-livedocs.com/data/p...3f67f896a6.pdf

No one mentions this oil and my local Lordco has it.

67' Duetto 1600
74' gtv 2000
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post #110 of 116 (permalink) Old 01-24-2017, 04:17 PM
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Looks like that serial number or production date cutoff would be helpful for others with early cars. I now have the GL-1 in the gearbox, and everything seems to be returning to normal. Sure hated to see all that new Redline 75W/90 NS dumped into the 'used oil' drum after just a couple of days.....and double the labor cost.
Its still not back to normal according to 2nd gear..... better, but not where it was. I plan on putting a few more miles on this GL-1 fill.... dump and flush with kerosene I guess..... then start over. Oh well its just money.

1966 Duetto
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post #111 of 116 (permalink) Old 01-26-2017, 08:35 PM
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The GL 5 is listed as not to be used for 1300 or 1600 thus duettos. As per Centerline

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post #112 of 116 (permalink) Old 01-27-2017, 02:26 AM
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The GL 5 is listed as not to be used for 1300 or 1600 thus duettos. As per Centerline
It depends on the build date. "Around" 1966 Alfa went from steel to moly synchros, which is the justification for the different lubricant requirement.

Centerline's info is based on the cutoff point for the sale of 1300-1600 Alfas in the US: 1967 was the last year they were imported officially. A Giulia sold in 1966-1967 may or may not have been built before the cutoff point. There were no 1968 US models and by 1969 only the 1750 was offered.

But first, 1300 and 1600 105/105/116 Alfas of various types were kept in production into the 80s, and their gearboxes all had moly synchros and need GL4/GL5. Some of these cars have trickled into the US, actually they were sold in Canada up to 1972 and of course elsewhere for a long period.

And second, steel synchros have not been available for a long, long time and any 101/105 gearbox that has been rebuilt since has moly synchros.

When the gearbox is out of the car, you can actually see inside the gearbox and differentiate the type of synchro by peeking in the fill hole with a small flashlight.

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post #113 of 116 (permalink) Old 02-05-2017, 11:08 AM
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IAP used to recommend and sell Liqui Moly SAE85W90 non-synthetic which was compatible GL1/GL4 gear oil.

A german product and just a little pricey at about ten dollars a litre.

Has any one used this product in their early 105 gearbox, and can you elaborate on your experience.

Thanks very much,

Bob

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post #114 of 116 (permalink) Old 02-19-2017, 04:51 PM
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Or has anyone used Miller's Classic 90W Green Gear oil.

They state its is for early non-EP gearboxes and is truly GL-1 rated.

Any experience shared would be appreciated.

Bob

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post #115 of 116 (permalink) Old 03-05-2017, 08:01 AM
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Or has anyone used Miller's Classic 90W Green Gear oil.

They state its is for early non-EP gearboxes and is truly GL-1 rated.

Any experience shared would be appreciated.

Bob
OK... here we go again. Dumped the NAPA GL-1 and flushed the gearbox with kerosene. Refilled with Miller's Classic 90W GL-1 Green Gear oil.

Much better result..... after a couple of cold double clutch shifts.... its fine after warming up. I am going to drive it this season and re-new the Miller's again next fall.

1966 Duetto
1976 Spider Veloce
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post #116 of 116 (permalink) Old 03-05-2017, 09:18 AM
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Cool! Glad this worked out in the end. I just started following this thread today- I didn't want to read another "Best Oil Jihad" thread, but this ended up to be informative.

I have an S3, and before the xmission was rebuilt I put Redline in. Helped a lot, but 2nd and 3rd were just two far gone. I've always loved how it shifts in the cold weather in my cars.

Motor on!

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