I've never bothered replacing mine. Can't say I've noticed any adverse effects and I've done nearly 50k miles.
The T6.1 is the most disappointing van I've ever owned. Undertray torn off, water in tailgate, bluetooth unusable, DAB radio can't get stable reception, SOS call thing warning that I can't get sorted, radar sensor for cruise often "impaired", van often goes into reduced power mode with glow lamp flashing.
Only had the van three years but I'm seriously considering a Vito or Vivaro.