im in the same boat you are but I have a 80K spree on not changing anything besides brakes 10K ago...just cause I wanted slotted ones!
Once I hit 200K I'm doing a FULL FLUID change...any fluid I can find including coolant
then go over all suspension parts for cracked or broken bushings
and most likely change the plugs, i might try these E3 but I might chicken out and just go with OEM Bosch