For it is a combination of cost of repairs, value of the vehicle, and reliability. In this example, I am removing the emotion from the equation as I have car I will probably never get rid of.

I do not have the room, time, or patience to wrench anymore and I need the car to run. This means labor is a factor.

What I do is look at am I spending more a month than I could buy another car for in better shape? Will that car have a warranty?

In addition, if I get to the point I cannot trust the car to get me to my destination then it is time to go.

I recently had a truck I replaced due it it needing 4k in repairs to get it reliable again and I figured another 1500 to fix the next round of items. It just wasn’t worth it as it’s retail value was 4200 and I had the cash to buy a much better vehicle.