FAQ Can I mention the Valorlub contribution separately on my sales invoices? How do you distinguish between domestic and professional oil? Who determines the Valorlub contributions? I buy oil that I market under my name on the Belgian market. (Private label). Can I ask my supplier to take over the administrative obligations towards Valorlub from me? Do I have to pay VAT on the Valorlub contribution? Can I join Valorlub retroactively? Is it mandatory to join Valorlub? Is the supplier or Valorlub responsible for the collection of used oil? Can I burn or heat with waste oil? Other facts