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Old 11-17-2019, 08:17 AM   #13
Forddan
Senior Member
 
Join Date: May 2019
Location: Westford, MA
Posts: 195
Default Re: I am so happy......With my 1500W gear oil...

Quote:
Originally Posted by rotorwrench View Post
....Restoration Supply touts that it is good with yellow metals but I wonder where that information came from. Chevron's info even states it has the heavy smell of EP additives.
CHEVRON Meropa info states that the copper corrosion test is 1B.

I searched online what 1B means. I found this video and pasted the below section:

https://youtu.be/WfDRmMXUTy4


....The technician will report the results as a number followed by a letter according to the ASTM ranges. These ranges include freshly polished, slightly tarnished (1a to 1b), moderately tarnished (2a to 2e), dark tarnish (3a to 3b), and corrosion (4a to 4c).

This test is often performed for automotive companies to determine how suitable a lubricant is for lubricating parts such as bearings that contain copper or copper alloys because corrosion can cause premature bearing failures. While this test does not measure the ability of the grease to inhibit copper corrosion caused by factors other than the grease itself nor does it measure the stability of the grease in the presence of copper, it does ensure that a grease will protect the metal surface it comes in contact with over time......

Link to Chevron Meropa info file:

https://cglapps.chevron.com/msdspds/...&docFormat=PDF

Could be, that Restoration Supplies states "Does not affect yellow metals " because the copper corrosion test is 1B on all of these Meropa gear oils ?

Daniel

Last edited by Forddan; 11-17-2019 at 08:28 AM.
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