This is what I do ( maybe overdoing to some while peaceful to my mind )
1. weekly
After each drive ,using my air compressor , i open the bonnet and air jet the surface then comes the air filter and its box.
I take the car and lift it up and inspect what ever can be seen ( mainly lower arms , bushings and tow points especially after tugging and being tugged that day ) after that complete jet wash.
( probably my X is the only one which doesn’t squeak ! )🤪
offcourse routine check to the fluids by self just day before the event
2. At 8k I change the engine oil I use personally the 5W40 fully synthetic and feels like driving on cotton ( smooth rumble as if not heard ) and along all other checks
3. I check half way specified time for rotein service and for me breaks and suspension is number 1 priority