1) Where can I source small and big bushings for my car? And what do I need to be looking for? They are due for replacement as advised by some mechanics before.

2) I had the yellow low oil level (not the red low oil pressure) dashboard icon light up two weeks ago and when I check the dip stick, the oil level is still around 25% from the bottom dot. I still topped up with around 500mL bringing the oil level to around 80% from the bottom dot and the icon eventually went away. Does this point to a broken oil level sensor? I was under the assumption that if that icon lights up, that means the oil level is below the bottom dot already or am I wrong on that?

Thanks.