My car is currently 8 years and 150k miles with no issues. There was some leaks to fix, but nothing significant, only $300 for the entire work. I have a truck that is now 22 years old and also 150k miles, but it is a diesel and so you will probably say it doesn't count. My last car (sold only because my job let me take the bus) was at 260k miles and no issues (though I did change the timing belt on schedule).

Modern cars will generally last at least 300k miles today with few problems. When the finally die it is because the body is shot - something that has nothing to do with the power train. (I live in an area where winter means a lot of salt on the roads, my friends in warmer areas report cars lasting even longer).

Of course I probably shouldn't say this. People like you who trade in their almost new cars all the time because they are afraid they are a money pit keep people like me in nice cars for not much money.