If you can find a good workshop manual it should have all the spec's on fluids and amount for each one.

That is what i need to buy soon (just got my 01 a wk and 3 days ago) because the owners manual does not have that much info compared to my '93 Range Rover owners manual.

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2001 X5 3.0i "Dodi"
1993 Range Rover County LWB (71,600 miles) "Bertha"
1991 Range Rover parting out