bredahan

Hi! I have a 1.6TDI with just over 200,000k and for the second time in 2 years I've had issues with injectors with the typical rattly noise and misfires when starting from cold. I had 4 reconditioned injectors fitted in November 2023, and I've just had 3 injectors cleaned and 1 reconditioned injector fitted this month (reconditioned came in much cheaper than new). The garage I went to said there was no need to flush the fuel system, but did recommend using the premium fuel options going forward and named a certain chain of filling stations to avoid. I have a few questions: 1. I know the advice here is generally to avoid, but in my case should I be using any fuel additives? 2. Should I swap the fuel filter more regularly than indicated? 3. Any other advice? Things I should do to avoid this happening again? Thanks.