After each engine oil change, small amount of oil is left. Can these be put together and used for next oil change?

They are of different brands, and different weights: Amsoil 10W-40, Amsoil 20W-50, Castrol Syntec 5W-50, Shell Rotella T 15W-40, Mobil 0W-40, etc.

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1992 300D 2.5 turbo diesel. 319 k miles.
124.128 chassis, 602.962 engine, 722.418 tranny.