that I do not know first hand.

 

I'll be playing with diff fluids next week. I use LE607 so I'll give it a sniff for you

 

I didn't notice anything smelly about LE607 when I did a change a few weeks ago. It's very purple, though. *shrug*

 

Odd. I've always been of the opinion that high sulfer content was a must for rear diff applications. Something to do with metal to metal contact is under severe pressures and load.
To date, I've never seen anyone report back with an oil analysis of LE fluid after it has been in one of our rear diffs for a standard change interval. I think it's time and I hope we see nothing alarming.

 

It would be nice to get a UOA of LE607. Also, yes, every GL5 certified fluid I ever had the displeasure of smelling, smelled like sulfuric ass.

 

Maybe I have a tolerance for sulfer smell? Because the fluid went into a car with 50k miles that had its diff fluid changed at the regularly scheduled 30k service, and the fluid that came out didn't smell either.

 

maybe that's the case. you can smell GL5 diff fluid alright. it's a smell that practically coats the back of your throat and makes you gag. lol

 

And the smell will linger in your garage for days, sometimes weeks. It's not difficult to miss. Maybe it is your sense of smell, but if it were me, I would begin to wonder if it was indeed GL-5 that's been in there.

 

Hmm, well the service schedule says "Replace differential oil (use SAE90 hypoid gear oil, API classification GL5 or GL6)" - what's different between GL5 and GL6?

What the heck do those terms mean anyway? I'm having a difficult time figuring that out, even with Google.

Anyway, here's the LE 607 page:
http://www.le-international.com/prod...lay.aspx?id=44
They talk about AGMA ratings, not API GL- ratings. They do specifically mention "extreme pressure characteristcs." So maybe they achieve that w/o sulfer?

Hmm, this is funny - several of the pages I find via Google say GL-6 is an "obsolete" designation?

 

Here's an interesting writeup:
http://theoildrop.server101.com/cgi/ultima...56;t=000013;p=0