Hi, I just bought a 1991 e36 325td.The car is in great shape ,but I want to change the motor oil .Since i couldn't find anything about this diesel engine,and I don't have an owner manual I' hoping some of you might help me.The question Is Which oil (manufacturer and viscosity) is recomended for my engine and how much it goes in?

ghead
Q2 Which atf should I use in my gearcase(manual 5 speed) and in diff?
Thanks