I need to do oil change.
Is 10 40 alright or should it be 10 50 ?
Do I use same oil for tranny?

Lucas eng treatment was suggested for tranny to keep seals from withering. Any thoughts.
Thanks


71 Plus8 Yellow/Blk
57 Morris Minor Trvlr 1098cc
93 MB 500E
66 MB 230SL
48 Chev Fleetmaster Conv LS1