Even if you had to put in a new engine , it is still cheaper to fix it than buy a new one...if you like the car. insurance ,and taxes will be cheaper, You could put more in it than you can get out of it , but if you plan to keep it ...GO For it... Plus future maintenance will be less costly than a new one , if it were mine I would do it even with a new motor or the present motor fixed I have seen those cars go 2 -3 hundred thousand miles with proper maintenance.