This forum is for TDI (Turbo Direct Injection) questions/posts. Non-TDI Motors (Including the 1.6, and 1.9 or other variant turbo diesel motors) should go in the VW Diesel General Forum
Don't do it on TDIs . It will build up carbon in the cylinders, combustion chamber .
Use a good Diesel Fuel aditive such as Stanadyne. If you have no choice , and must use any oil, I would use ashless 2 cycle TCW3 oil. But no ATF.