GM limited-slip additive fluid

[Keith B.]

Is there really a difference between the GM re-labeled fluid vs what you buy at any local auto parts store?

[Joe L.]

Re: GM limited-slip additive fluid

Is there really a difference between the GM re-labeled fluid vs what you buy at any local auto parts store?

Keith------

Well, we know this: GM does not manufacture the fluid and never did. Is it exactly the same as other brands? That would be an extremely difficult question to answer without "inside knowledge" which would be almost impossible to come by. That's because even if it is manufactured by the same company or companies as other brands, that does not mean that that company or companies manufacture the other brands to the exact same spec as the fluid they manufacture for GM.

[Mark F.]

Re: GM limited-slip additive fluid

Is there really a difference between the GM re-labeled fluid vs what you buy at any local auto parts store?

Keith------Well, we know this: GM does not manufacture the fluid and never did. Is it exactly the same as other brands? That would be an extremely difficult question to answer without "inside knowledge" which would be almost impossible to come by. That's because even if it is manufactured by the same company or companies as other brands, that does not mean that that company or companies manufacture the other brands to the exact same spec as the fluid they manufacture for GM.

Keith and Joe,

I would have to say there are definitely differences...but proving what those differences and how much they really matter is another story...

Automotive specs for chemical products I have been familiar with are usually performance based. That is the spec will say something like this for a different example I can think of:

[Gary R.]

Re: GM limited-slip additive fluid

I am not a chemist, but I have built 100's of vette differentials and have always used and recommended the ac additive and Lucas 85-140 non synthetic gear oil. You can use a 90 wt as well if you like.

It has worked for me and the 100's of diff's without issue. The only thing I noticed with the last part number and name revision, was one bottle might not be enough. So, I always use 2, again no issues.

Now all those diff's I built had polished and tuned posi's in them, no spring packs, and only solid steel clutches. No fiber, no snowflake clutches thank you. With solid steels you can use a higher priced marketed synthetic oil but not with the fiber clutches.

I change it out at the first 500 miles on a blueprinted diff and again at 8-10k miles. It works, the oil and additive are, or were, easy to get, and you don't have to think any more about it.

[Mark F.]

Re: GM limited-slip additive fluid

I am not a chemist, but I have built 100's of vette differentials and have always used and recommended the ac additive and Lucas 85-140 non synthetic gear oil. You can use a 90 wt as well if you like. It has worked for me and the 100's of diff's without issue. The only thing I noticed with the last part number and name revision, was one bottle might not be enough. So, I always use 2, again no issues. Now all those diff's I built had polished and tuned posi's in them, no spring packs, and only solid steel clutches. No fiber, no snowflake clutches thank you. With solid steels you can use a higher priced marketed synthetic oil but not with the fiber clutches. I change it out at the first 500 miles on a blueprinted diff and again at 8-10k miles. It works, the oil and additive are, or were, easy to get, and you don't have to think any more about it.

Thanks, Gary,

and there's the proof...what works and works well over 100s of rebuilds is where you should go...

[Doug C.]

Re: GM limited-slip additive fluid

Check the SDS data sheets. www.acdelco.com/saftety-data-sheets

[Joe L.]

Re: GM limited-slip additive fluid

Check the SDS data sheets. www.acdelco.com/saftety-data-sheets

Doug------


Lubrizol is also the company that makes the best gasoline lead substitute additive called Powershield. It is the "active ingredient" in the best of the various lead substitute formulations but it's not that used in all on the market. As far as I know, Powershield is not available at retail under that brand name but it's possible that it is now as it's been a long time since I looked.