You'll probably need a tool to remove the cap on the oil filter canister.
Most often, oil is "sucked" out the dipstick tube rather than drained from below, and the tool to do this is probably what your "sources" are referring to.
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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles
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