“I haven’t brushed my teeth, but I don’t have a cavity - so I’m good”.

Don’t get me wrong, my “fun” car (an old, beat up Jeep) is going on 2 years with the same oil (I barely drive it), but I known I need to change it soon.

Oil degrade with oxygen. Every time you drive that car, the oil are being re-oxygenated and continuing to degrade (along with being exposed to combustion byproducts).

Also, the type of wear you get often isn’t noticeable until it becomes catastrophic. In my case, a 30 year old car that’s already on its last legs “catastrophic” is more like “time to finally drag it to the scrap yard”.

Probably time to change the oil.

Motor oil is a wear product with a lifespan. It will become saturated with microscopic particles of metal and end up with lower lubricity. You are just slowly grinding away all the metal off the moving parts. Eventually the tolerances will fail, usually a rod bearing, leading to self-destruction of the motor.

I mean technically you never need to change the oil on any car if you're willing to just drive it into the ground.

There is a YouTube channel sponsored by people like you:

https://youtube.com/@i_do_cars