Outer Limits 4x4 Board

Has anyone used this stuff? Is it any good?

I know people rave about the oil and fuel additive but is the antiwear as good as they say?

If you put this stuff in a limo will it stuff the locking up action?

I've used it. I put it in the engine, gearbox, transfer and front diff - NOT the rear LSD. Not sure if it does much.
I also got the engine oil flush stuff. It seems to work well - blobs/chunks of oil came out.
And I got the fuel additive aswell - seems to work OK aswell.