I was reading the back of the Lucas bottle at an automotive place and it said to be used for Diffs and if your diff requires a LS additive it is not required.

Anyone try it? Use it? And why would it say the additive isnt needed?

 

Because it's already in there. Several oils are like that now. Quaker State for instance has one.

Lucas oils can be problematical. The "climbing" additive they add is really only good for lower speed gearboxes. It can cause foaming of the oil and inhibits the breakdown of the bubbles.

I believe this has been discussed and shown over at http://www.bobistheoilguy.com

Probably better if you stay with a good brand WITHOUT that "special" climbing additive, or a good synthetic which works with LS. Some synthetics have properties that don't require them to have the "friction modifier" that limited slip additive is.

 

I have redline 75w-90 going in tomorrow..
on the other hand I've heard really good stuff about
http://www.specialtyformulations.com/
but as I have the redline sitting here for 6monthes now.. IT IS GOING IN TOMORROW.
Last 4 weeks I have tried and its been raining or snowing! on my days off.
Tomorrow its getting changed.. I dont care if its snowing.. I'll just pump the old stuff
out instead of taking the cover off. IT WILL BE DONE tomorrow lol...

Edit: what John said about the lucas.. was shown with the lucas additive
to another oil ie pennzoil..
It has never been shown that lucas brand oil which should have the proper
level of antifoamants etc would do the foaming/nastyness as shown on
bitog.

Personally if you are going mail order I'd go for
http://www.specialtyformulations.com/ 1st
Shaffer's 2nd
Redline 3rd
Rand

 

the reason i was trying lucas was because i dont have to mail order it. like amsoil and those other brands listed. idk might still try it.

 

I used it just a few month ago!? Still no problems.

 

I have the Lucas Diff fluid in my rear end and have no complaints. It brought some life back to my pretty worn limited slip. I'm with you on the not ordering stuff. When I wanna do something I wanna do it now, but really I should get some amsoil. I would like to try what everyone raves about.

 

the ams makes no noticible difference in the diffs at all.

glad some others are using it. im gonna put it in this time.