I must admit when I am filling mine I use the set amounts but it does start to run out the filler hole on both diffs just as the last ml is going in - so in reality I dont think it matters if you fill the old way to the bottom of the filler - might be different with an initial fill where there has not been oil in the diff previously but not where the diff has previously had oil in it.
Garry
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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