Should have explained better, the 4x4 requires 4.5 litres per oil and filter change, however the 3 doors, 2wheel drives and even the escossies only require 3.7 litres per oil and filter change, hence the because Mobil 1 and Castrol RS are only sold in 4 litre cans , so us poor 4x4 owners have to buy two cans per oil change, unless you buy Millers CFS, which is sold in 5 litre quantities, but is not always available off the shelf