I am a little confused on the right oil and additive to use in my diff. I have heard that you should only use gm products for the LSD additive and oil. A lot of conflicting info out there. I plane to use a 80W-90 gear oil that is rated GL4 and GL5 and Amalie LSD additive (4oz). Does it make a difference what brand you use? I have looked at different threads and they don't quite answer my questions. Thank you in advance for any comments.