a brand new 722.6xx tranny for w140 takes 8.6 liters of atf never filled before. However I dont think youll need 8.6 liters but around 6 +7. When you drain a tranny of atf you never get out all it.

MB 236.10 ATF or shell ATF 3403-m 115

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)