Blackstone Labs answered an inquiry regarding sample size and analysis. 1. For a VOA, they need three ounces or 90 mL. 2. In a thread about how oils without moly perform using other additives, there was speculation that the German Castrol may contain Antimony. Well, if you want to test for Antimony in your VOA, be prepared to wait two weeks and to pay an additional $150 US.