Just wondering which method everyone is using. On my Cforce I drained both front and rear and filled up until the oil started coming out. On my Zforce I actually measured the amount listed in the manual (330ml front and 400ml rear). I see no difference either way. I will say that the metric system is growing on me. I have fought it my whole life but it really is easier to use. Like my oil in the Zforce. I get it hot, drain it and replace the filter. I fill my metric marked pitcher to 2900ml and fill it up. Perfect every time.