l am looking at a subaru justy with about 180k miles on it, and l was wondering how many more miles l can cram on that little 4wd as a daily driver before id have to replace the motor, and how much would that cost?

Good for another 50,000 at least if you do not abuse it.and then take it to Pick-A-Part and put it to rest.

l have seen them up to 250,000 miles and more. Keep up the oil changes and maintenance.

l am surprised that it is still running. Parts are almost impossible to get.