Germany is not purchasing Russian oil. The only two EU states doing so are Hungary and Slovakia and both have vocally pro-Russian governments.
https://www.reuters.com/business/energy/kazakhstans-january-...
And here's KazTransoil themselves reporting how much they supplied through Druzhba recently: https://www.interfax.kz/?int_id=21&lang=eng&news_id=75303
> ASTANA. Sept 4 (Interfax-Kazakhstan) - The volume of Kazakh oil transportation to Germany via the Druzhba pipeline system in August of this year amounted to 190,000 tonnes, which is 18.7% higher than the level of July 2025, Interfax-Kazakhstan was informed by the national company KazTransOil (KTO).
So we find that, once again, Germany is buying "Kazakh" oil that is transported by Russia and mixed with Russian oil.