I am not a BMW expert and don't know what year has that transmission but I think off hand that at least some 740's do run a fairly regular fluid. I would advise jumping on the Castrol lube guide and seeing what is recommended for your year. Generally they will just refer you to the dealer if it really has to have a genuine fluid, and if that's the case I strongly recommend you follow the advice. (although checking on a BMW forum may show you that the genuine fluid is also available from whichever company makes it for BMW cheaper)
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