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Old 03-02-2012, 04:37 PM   #1 (permalink)
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Default Copper Strip Tarnish Test (ASTM D130-10)

The Copper Strip Tarnish Test (ASTM D130-10) is a standard test of a lubricant to indicate how corrosive it may be to copper alloys in a transmission.

My Sidekick has brass synchromesh transmission components that may be vulnerable to additives found in some GL-5 lubricants. As a result, my owner's manual specifies a GL-4 lubricant for the manual transmission and transfer case.

Lubricants that are "yellow metal friendly" are hard to find. I perused through data sheets and called lubricant manufacturers to find copper strip tarnish test results for their products. Those lubricants that I found test results for are in the posted table:

https://www.suzuki-forums.com/gallery..._10_Fluids.jpg
Click on the table to magnify it.

A brief description of that test can be found here: description D-130. The classification scale ranges from 1A (least corrosive) to 4C (most corrosive).

Last edited by fordem; 03-04-2012 at 08:46 PM. Reason: User request
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Old 03-02-2012, 07:42 PM   #2 (permalink)
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Click on image to enlarge:
https://www.suzuki-forums.com/gallery/index.php?n=1603

Here's another view of the same information:

M/T FLUID & GEAR OIL SAE API CLASSIFICATION

Amsoil Long Life FGR...75W-90..GL5..1B Dark Orange
Amsoil Severe Gr SVG..75W-90..GL5..1B Dark Orange
Amsoil M/T Fluid MTF......5W-30..........1A Light Orange
Amsoil MT & Gear MTG.75W-90..GL4..1B Dark Orange
Citgo Citgear Std XD...75W-90..GL4..1B Dark Orange
Delo Gear Lubric ESI....80W-90..GL5..2A Claret Red
Delo Trans Fluid ESI.....50W...............2A Claret Red
Red Line MT-90............75W-90..GL4 1A Light Orange
Red Line NS Gear Oil....75W-90..GL5 1B Dark Orange
Red Line 75W90 GL-5..75W-90..GL5 1B Dark Orange

Last edited by pjf; 03-02-2012 at 10:42 PM.
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Old 03-03-2012, 09:45 AM   #3 (permalink)
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Here is a table of 10 gear lubricants with results of their Copper Strip Tarnish Test results.

Attached Thumbnails
Copper Strip Tarnish Test (ASTM D130-10)-copper-strip-tarnish-test-10-oils.gif  

Last edited by fordem; 03-04-2012 at 01:39 PM. Reason: Fix image size
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Old 03-03-2012, 10:46 AM   #4 (permalink)
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Forgive for asking - you have three posts each with links to what appears to be the same information, which you have also transcribed.

Do you plan on posting the same information every day? What's the point? Where is it taking us and why do you feel the need to keep hammering it home? Would not the first post have been sufficient?

Looking at the actual information there are GL4s that have a 1B classification and GL5s with the same classification, making them apparently equally corrosive - maybe I shouldn't hunt down a GL4 for my transmission, it's likely to be just as corrosive as the GL5 I have in it now.
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Last edited by fordem; 03-03-2012 at 11:20 AM.
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Old 03-03-2012, 11:33 AM   #5 (permalink)
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Quote:
Originally Posted by fordem View Post
Forgive for asking - you have three posts each with links to what appears to be the same information, which you have also transcribed.

Do you plan on posting the same information every day? What's the point? Where is it taking us and why do you feel the need to keep hammering it home? Would not the first post have been sufficient?
If you looked at my email to the Administrator or Moderator, which I assumed was you, you will find that I had requested help in posting an image or table that is large enough to be readable. I also requested help in fixing a busted link in this thread.

I am now requesting that you please read your private mail, supply me with the help that I requested earlier via PM, and delete this thread. I can restart this thread with the proper image and links once I get your help.

Thank you.
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Old 03-03-2012, 12:19 PM   #6 (permalink)
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http://www.synthetic-oil-tech.com/Ge...te%20Paper.pdf

I was sufficently intrigued by your post that I used google to determine how the transmission fluid of my choice (Mobil1 75w90 Synthetic - which is a GL-5) compared - see the above white paper, it's an Amsoil white paper so there's not likely to be any bias toward the Mobil1.

As far as the copper tarnish test went it was a 1b, no worse than two of the three GL-4 oils in your chart.

I'll take a more indepth look at the white paper later because I can no longer get the Mobil1 here and need to find a new transmission fluid.
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Old 03-04-2012, 11:48 AM   #7 (permalink)
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Here's an updated list of lubricants and their ASTM D130 classifications. It includes the lubricants from the Amsoil paper.

M/T FLUID & GEAR OIL WEIGHT API CLASSIFICATION

Amsoil Long Life FGR 75W-90 GL5 1B Dark Orange
Amsoil Severe Gr SVG 75W-90 GL5 1B Dark Orange
Amsoil M/T Fluid MTF..5W-30.....1A Light Orange
Amsoil MT & Gear MTG 75W-90 GL4 1B Dark Orange
Castrol Hypoy C......80W-90 GL5 1B Dark Orange
Castrol SYNTEC.......75W-90 GL5 1B Dark Orange
Citgo Citgear Std XD 75W-90 GL4 1B Dark Orange
Delo Gear Lubric ESI 80W-90 GL5 2A Claret Red
Delo Trans Fluid ESI 50W........2A Claret Red
GM Synthetic Axle....75W-90 GL5 1B Dark Orange
Lucas 75/90 Synthetic75W-90 GL5 4B Graphite Blk
Mobil 1 Synthetic....75W-90 GL5 1B Dark Orange
Mopar Synthetic
w/Mopar LS additive..75W-90 GL5 4A Trans Black
Pennzoil Gearplus....80W-90 GL5 1B Dark Orange
Pennzoil Synthetic...75W-90 GL5 1B Dark Orange
Red Line MT-90.......75W-90 GL4 1A Light Orange
Red Line NS Gear Oil 75W-90 GL5 1B Dark Orange
Red Line 75W90 GL-5..75W-90 GL5 1B Dark Orange
Royal Purple MaxGear 75W-90 GL5 4A Trans Black
Torco SGO Synthetic
w/Torco Type G LS....75W-90 GL5 1B Dark Orange
Valvoline High Perf..80W-90 GL5 1B Dark Orange
Valvoline SynPower...75W-90 GL5 1B Dark Orange
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Old 03-04-2012, 01:36 PM   #8 (permalink)
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I'm a moderator, not the administrator, and no, I haven't received any emails - if I had I would not have needed to ask - let me see what I can do.

OK - check your post above - is that what you need done? If you have another chart you can PM me a link - or - if you click quote on your post above (the one I edited) you'll see how to use IMG tags to link to an image.
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Last edited by fordem; 03-04-2012 at 01:44 PM. Reason: Add info
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Old 03-05-2012, 12:11 PM   #9 (permalink)
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Quote:
Originally Posted by fordem View Post
I am sufficiently intrigued by your reference to the gear lube paper to study it. Based on the paper and the results of the ASTM D130 tests, I have decided to replace the Delo fluids that I am using in my Sidekick after only 1,000 miles.

As I reside in Colorado, the Amsoil SVG is attractive as a differential fluid due to its Brookfield (cold temperature) viscosity. I see from the Red Line website that its 75W-90 GL-5 oil now passes the same Brookfield test so I will further research its MT-90 oil for my transmission and transfer case.

Do let me know what you decide as a Mobil-1 replacement.

Thanks for your help in fixing the broken image link in the 1st post. I still have some distance to go before I figure out how to make the image readable.
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Old 03-05-2012, 12:47 PM   #10 (permalink)
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You're welcome - also - I think the "readability" may be more an issue of the size than anything else - what I would suggest is doing a screen capture and then pasting it into MS Paint, and then resizing it there before saving it - it's worked for me on a number of occasions.

I haven't found/made the time to read the white paper, but I'll probably go with the Valvoline synthetic, which I think is available here, the other option would be Castrol, and I've sort of sworn off Castrol products - I used them exclusively for many years, and then I discovered that they can form sludge in an unopened bottle.

I know that may sound strange, but, I'm not going to tell any Castrol afficionado not to use his/her favourite oil, I'm just going to ask them to keep an eye on what comes out of the bottle - as they get to the bottom of the bottle, sooner or later (sooner rather than later), they'll see what I saw, that golden honey color getting dark.

Amsoil, is not available here "over the counter", I do know someone who imports it for personal use (one of our Caribbean MotorSport competitors), but there's no guarantee he will have what I need when I need it.
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