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Joined: Sep 2008
Posts: 14
Grease Monkey
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Grease Monkey
Joined: Sep 2008
Posts: 14 |
What grade/type of gear oil should we be running in our old car transmissions. Do they use something other than what we find on the auto parts store shelf today? Thanks
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Joined: Dec 2007
Posts: 4,024 Likes: 99
ChatMaster - 4,000
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ChatMaster - 4,000
Joined: Dec 2007
Posts: 4,024 Likes: 99 |
You will get lots of different ideas and opinions on this. A key point is that any gear lube you put into that transmission today is way better than anything that was available when the car was built. Plus unless you are in a very different situation you will never put enough miles on the car to wear anything out.
I am currently running an 85w-140 GL5 in my ”˜37. I plan to switch to a similar weight lube that is better suited for a synchromesh transmission when I get this one to stop leaking. Otherwise is is a waste of money.
Last edited by Rusty 37 Master; 10/21/20 11:42 AM. Reason: Remove extra letters.
Rusty
VCCA #44680
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Joined: Sep 2008
Posts: 14
Grease Monkey
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Grease Monkey
Joined: Sep 2008
Posts: 14 |
Has anyone heard/read anything about the "yellow metals" (brass, copper, bronze) in the old transmissions being damaged by the sulfur in the GL-5 gear oil ? ? Thanks Rusty
Last edited by tunatongue; 10/22/20 06:54 AM.
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Joined: Nov 2002
Posts: 7,472 Likes: 26
ChatMaster - 7,000
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ChatMaster - 7,000
Joined: Nov 2002
Posts: 7,472 Likes: 26 |
I would only use a gear oil that is recommended by BOTH the manufacturer and the lubricant producer.
Last edited by m006840; 10/22/20 09:20 AM.
Steve D
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Joined: Jun 2007
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ChatMaster - 1,500
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ChatMaster - 1,500
Joined: Jun 2007
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Russell #38868
'48 4 door Fleetline
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Joined: Dec 2019
Posts: 1,139 Likes: 75
ChatMaster - 1,000
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ChatMaster - 1,000
Joined: Dec 2019
Posts: 1,139 Likes: 75 |
Modern GL-5 lubricants WILL NOT attack copper brass or bronze. That hasn't been an issue for many many decades now. When you read the post linked to above by Russel... Pay attention to what Gene Schneider says. He knows his stuff and has the experience to back it up. You might also want to read this: https://vccachat.org/ubbthreads.php/topics/448985/sea-90-vs-sea-80w-90.html#Post448985 as it is as applicable to a 53 as it is to a 72. Have a good one!
Ole S Olson
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Joined: Nov 2002
Posts: 7,472 Likes: 26
ChatMaster - 7,000
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ChatMaster - 7,000
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The GL rating is a measurement of the oils extreme pressure rating and does not indicate whether or not it effects certain metals. There are four classifications:GL-1,4,5, and MT-1. The higher the number such as 4 or 5 the higher the extreme pressure rating. It still is best to determine if the vehicle mfg. and the oil mfg. approve a product. Some GL-5 oils can be used in some applications and others can not-it depends on the additive package and unless the mfg. says it can be used with copper/bronze non-ferrous metals then I would not use it. Chevron for instance says their GL-5 can be used in place of a GL-4 however that is only for the extreme pressure rating. Their GL-1 specifies for use where their is concern for attacks on copper or bronze components. Again unless the mfg. states that the product is suitable for use with copper and/or bronze components I would not use it. I am guessing that many if not most mfgs have put in additives to their GL-5 oils so they can be used in gear boxes with copper/bronze but if that is not stated and a problem arises I would not look for help from that mfg. .
Steve D
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Joined: Mar 2019
Posts: 70
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Mar 2019
Posts: 70 |
Hello m006840:---AMAN miy friend!!
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