and it needs no additive! 
you will luv this stuff! 
looks cool ! 
Differential fluid?
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Racer
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Melting Slicks
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Instructor
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When I first changed out my 86Z51's diff gear oil(to Redline synthetic 75/90) about 12 years ago, I had similar questions about the additive? After speaking directly with the Redline tech guys, and several local Canadian lubrication engineers, all confirmed that no extra additive. incuding the GM additive, should be added, or rquired. From what I know to this time, most/all of the Synthetic gear-diff lubes have the proper additive(s) already included. Consult the oil manufacturer if in doubt! From what I've learned over the years, too much additive can cause problems too! Btw, I'm still using the Redline w/out additve extra, and no troubles on my 86 Z51. For what it's worth.
Race Director
Joined: Feb 2003
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From: Lake Wylie SC
When I first changed out my 86Z51's diff gear oil(to Redline synthetic 75/90) about 12 years ago, I had similar questions about the additive? After speaking directly with the Redline tech guys, and several local Canadian lubrication engineers, all confirmed that no extra additive. incuding the GM additive, should be added, or rquired. From what I know to this time, most/all of the Synthetic gear-diff lubes have the proper additive(s) already included. Consult the oil manufacturer if in doubt! From what I've learned over the years, too much additive can cause problems too! Btw, I'm still using the Redline w/out additve extra, and no troubles on my 86 Z51. For what it's worth.
Hey if your way works, stay with it.
Instructor
Joined: Jul 2007
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From: Toronto(Don Mills) Ontario
Hey, thanks, I will! I/we were asked, in effect, our personal, direct knowledge and experience on this subject, and I gave it. Those who asked, can take it, or not, as they will. Ciao.
Race Director
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