I have an 89 760 turbo. After reading the faq and forum posts I believe I have a solid rear axel by the spin test. However as far as the markings on the axle one reads 1023 3502382 neither of which match the #'s in the faq. I guess thats not realy important I was just curious as to what those #'s mean. I am basicly just want to change the oil. I know where the drain plug is just not sure about the fill. There is an electrical conection of sorts going in the axel which I think is probally an oil level safety. Is this where I fill it. Also I was just planning on putting plain 75-90 in from what I have read there is no need for a friction modifier. So bascicaly I just need to know if what I am assuming is correct.