Originally Posted By: quint
So is it also a fact that is well known in the oil and additive industry for many years that people using these horrible fluids in their open differentials, are experiencing untimely failures of same?
Because its also a fact that I have been doing this for literally as long as I can remember without a single differential failure.
Not trying to be saracastic (well, maybe a little) but I am coming up on the 1/3 of a million mile mark on one of them, and I would like to know when its going finally give up as a result of me having done this.
You still don't seem to be grasping the point and appearing to be obstinate just for obstinacy sake. Where did anyone say the FMs were "horrible" and causing "untimely failures?"
The info was simply presented as an FYI. Your open diff will not die immediately by adding LSD FMs to the gear oil, or having those FMs in it, but oil life will be shorter. Better if you don't use it but it's not immediately harmful if you do.
Second, are you an automotive engineer? Whitewolf is. He works in the drivetrain division of a major auto manufacturer and has to deal with lubricant qualifications/recommendations... probably on a daily basis. He would know because it's his business to know so that he can prescribe the right lubricants.
Me, I'm just a oil-geek schub who reads a lot, so feel free to discount anything I say.
Finally, you haven't put much skin in this game, except to relate some vague anecdotal observations. A few more details from you would help us to understand your POV, to whit:
Are you saying you went 333,000 miles on one fill of oil that had FMs in it and you tested the oil and it was fine? That would be very interesting info.
Or, are you saying you did routine maintenance and never had a failure over 333,000 miles. If so, what were your OCIs, what oil was used and what vehicle is it?