You must be looking at the wrong manual...either that or your manual was misprinted (has been known to happen). It is 8 US quarts with filter change. EDIT: It looks like the 2005 manual had a misprint...discussed in other forums.

See page 484.

http://www.mbusa.com/vcm/MB/DigitalAssets/pdfmb/ownersmanual/2006_e320cdi_e350_e500_e3505004matic_e55amg.pdf

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 161k miles
06 E320 CDI "Rutherford", Black on Tan, 180k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 147k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 81k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife