[Denniss]

Bf 1110B and various Bf 109 load plans specify oil weight as 0.91 kg/l, B4 fuel as .76 kg/l.
Internal fuel per engine should be a tad higher as Bf 110 had 1270l internal (some may be unusable in the tanks though).
Still no problem for the Bf 110 to fly with 300l drop tanks without need for extra oil.